# Attention

I, Rahil sehgal and Ankit Kumar made an whtsapp brillliant group. Interested persons can provide their whatsapp number. I will add you all

Note by Md Zuhair
3 years, 6 months ago

This discussion board is a place to discuss our Daily Challenges and the math and science related to those challenges. Explanations are more than just a solution — they should explain the steps and thinking strategies that you used to obtain the solution. Comments should further the discussion of math and science.

When posting on Brilliant:

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Sort by:

- 3 years, 6 months ago

The exact answer is $y = hcos(\frac{x}{\sqrt(lf)})$

- 1 year, 9 months ago

Oh so we need to find out the exact path of ray. I thought approximation would work

- 1 year, 9 months ago

Ya

- 1 year, 9 months ago

https://brilliant.org/problems/when-einstein-meets-huygens/

I have solved this , but I want to know if there is any better solution than what i have done ! Help me.

- 1 year, 9 months ago

Can you give me hint as to how you solved? I tried using Snells law. Didnt helped. (Im sorry.. but can we even use snells law??)

- 1 year, 9 months ago

?

- 1 year, 9 months ago

You can search Gravitational Lensing , that will give you the whole thing . I did it by finding the divergence of potential method.

- 1 year, 9 months ago

I am actually searching for a simpler solution

- 1 year, 9 months ago

What did actually happen to saved sets??

- 1 year, 9 months ago

Unfortunately, brilliant has removed them. I don't know whether this feature will come back . For further enquiries, you can mail the Brilliant staff.

- 1 year, 9 months ago

That was the best feature of brilliant :(

- 1 year, 9 months ago

Exactly!! :(

- 1 year, 9 months ago

There is now an option named as "Saved" below the notification panel. I hope you'll find your saved sets there. Check it out!

- 1 year, 8 months ago

- 3 years, 6 months ago

@Md Zuhair @Rahil Sehgal @Ankit Kumar Jain - I also want to join. Please add me.

- 3 years, 6 months ago

Pls comment your contact number below so that I can add u. :)

- 3 years, 6 months ago

hey, help in this one https://brilliant.org/problems/getting-back-to-the-old-things-6/?ref_id=1368848 thanks in advance. give me some hints as usual(Which i ask from u from 11th :P)

- 1 year, 9 months ago

@Rahil Sehgal what all will you discuss in the group

- 3 years, 6 months ago

Please comment if you got it.

- 3 years, 6 months ago

Thanks...

I have added you in the group

- 3 years, 6 months ago

Thanks.

- 3 years, 6 months ago

https://brilliant.org/problems/too-many-lenses/?ref_id=1559097

Can you help me with this problem ? You don't need to provide a solution, a hint will work for me.

- 1 year, 9 months ago

Use the concept of deviation caused by a convex lens. A ray of light reaching the lens at a distance 'y' from the optical axis suffers a deviation of delta=y/f . Now, the lenses are seperated by distance l by which you know the rate of change of slope which is delta/l. Set up the differential equation and you would get the result. @Richeek Das

- 1 year, 9 months ago

Thanks a lot. I didn't know that deviation formula ∆ = y/f . Did you just derive it while doing this problem?

Are you in FIITJEE too?

Thanks again!

- 1 year, 9 months ago

Okay , I got the the deviation angle , you don't need to explain it further

- 1 year, 9 months ago

Yes...I am from FIITJEE BHILAI

- 1 year, 9 months ago

Hey, how are you?

- 1 year, 9 months ago

Nice to meet you ! I am from FIITJEE North Kolkata btw

- 1 year, 9 months ago

Fine. Opened brilliant after a long time .My mail was bombarding mails from brilliant.

- 1 year, 9 months ago

Hmm, I have been opening for a week now. Please give link for some awesome question u find here... Which u r solving

- 1 year, 9 months ago

- 1 year, 9 months ago

Not that good my friend. :(

- 1 year, 9 months ago

Why bro? Overall how was your JEE ? This time the paper was easy thats what I got to know. But still there are some mixed reviews. Anyways you have another chance on April & all the best for Boards bro!

- 1 year, 9 months ago

Scoring mere 230/350 :(

- 1 year, 9 months ago

I guess your rank will be around 1600-4200 :''''''''''( ......Its okay, you have another chance bro to get a better rank in mains! And study harder for the one in April. Trust in yourself and stay motivated :)

- 1 year, 9 months ago

Thats a lot for me! I will be happy with that rank. Still preparing for April. Lets see....

I could have got 260. But very silly mistakes brought me down here. Never mind :(.

Still...

- 1 year, 9 months ago

if it's alot for you then why are you sad -_-

- 1 year, 9 months ago

it's okay... Learn from your silly mistakes! And cheer up now bro, move on n get ready for April.

- 1 year, 9 months ago

What was ur score in JEEM?

- 1 year, 9 months ago

I didn't give JEEM 2017 :( it's a long story! Anyways leave it as it doesn't matter.

- 1 year, 9 months ago

ok sure ...

- 1 year, 9 months ago

Last yeat IISc cutoff was 230.. So i have little chances of getting into IISc.... Lets see.

- 1 year, 9 months ago

Woahhh! You're all set :P

- 1 year, 9 months ago

Arre last year paper was difficult also :P.

- 1 year, 9 months ago

IISc cutoff was really 230 for general ??????? For some year I had seen the cutoff go as high as 325 . Where am I going wrong ?

Can you clarify?

- 1 year, 9 months ago

No. What u r talking about is direct admission... For 230s... They have to give interview.

- 1 year, 9 months ago

And i guess it was 230 only.... For OBC.. it was 198

- 1 year, 9 months ago

Whatever it is, you gear up for JEEM ON APRIL. 230 is really good. Getting 200+ isn't easy.

- 1 year, 9 months ago

It was 250 last year! That's what they're showing on Google. Google it!

- 1 year, 9 months ago

Ohh No wait. That's the cut off rank 250.

- 1 year, 9 months ago

Ohhh hahha. I see.. then I've no chance

- 1 year, 9 months ago

Who said you have no chance? You have chance toh! The one in April is is your hand, kill it there! And honestly 200+ isn't okay, it's really good bro.

- 1 year, 9 months ago

Yes that's what I'm talking about!

- 1 year, 9 months ago

You still have a lot chances bro ! 4 months make a huge impact!

- 1 year, 9 months ago

I agree with Richeek! You still have it in your hand bro. Rock it in JEE April one and JEE Ad .

- 1 year, 9 months ago

I saw OBC people WITH CRL of 5000 is eligible for IISc. Why so much for OBC? I mean... general 250 and OBC 5000???

- 1 year, 9 months ago

I don't know. Reservation sucks :P

- 1 year, 9 months ago

Actually :P

- 1 year, 9 months ago

I know far far far better people than me landing up at 230 s .... I mean... They had AIR 156 in KVPY SX. They were really awesome.... So I am not that sad too... still... lets see.... Well JEEA is the real game.

- 1 year, 9 months ago

That's true! Proud of you bro :') Kill it in JEE advanced ;)

- 1 year, 9 months ago

Yours? How much are you expecting?

- 1 year, 9 months ago

@Md Zuhair I spoiled it by lots of silly mistakes + stupid calculations (even (sinx)^2+(cosx)^2+1=3) .....expecting border 300.

- 1 year, 9 months ago

Similar mistakes from me too.... But ur score is awesome. What about thomas?

- 1 year, 9 months ago

What is your final percentile ? @Md Zuhair @Aaron Jerry Ninan

I'm getting around - 99.9633219 percentile ! I was pretty shocked :( I had expected much better as my marks was 319 .

- 1 year, 9 months ago

I have solved this one , but I would really like to hear the way you had solved it ! https://brilliant.org/problems/when-einstein-meets-huygens/

- 1 year, 9 months ago

My Percentile is not as good as urs. But approx 99.6 :(((((. Well help me in this plz Anyone https://brilliant.org/problems/getting-back-to-the-old-things-6/?ref_id=1368848

- 1 year, 9 months ago

Wowww :P Congratulations! @Md Zuhair @Richeek Das

- 1 year, 9 months ago

Richeek really got awesome Percentile. Myne is a bad one.

- 1 year, 9 months ago

-------__------ Your one is also great!! Do you want me to write a paragraph explaining how good your percentile is ? :P Anyways, move on with it and focus on what's coming next!

- 1 year, 9 months ago

If there is student like Richeek, one whole paragraph on 99.6 percentile would be an insult to him...

He is legendary :P

- 1 year, 9 months ago

Richeek has definitely done very well, no doubt about that. I can't even dare to insult him! I am so proud of you Richeek :P But @Md Zuhair you also did well and I am proud of you as well :P

- 1 year, 9 months ago

KI HOCCHE TA KI

XD

- 1 year, 9 months ago

SHURU KE KORLO XD

- 1 year, 9 months ago

Sotti ki hocche eta -_- But still I expected~100 rank with 319 marks.

- 1 year, 9 months ago

If I get 99.6 percentile in JEE Main January and again 99.6 percentile in JEE Main April, then due to different number of students appearing in two shifts,My AIR will be different,How will NTA then normalize this?Will they combine AIR of both or the NTA score ?Wouldnt it be unfair if they combine NTA score(for merit list) as the total students appearing will be different.

- 1 year, 8 months ago

The total number of students appearing for JEE Mains 2019 will be the maximum of the number of students appeared on Jan and appearing on April. So your AIR won't be different as the total no.of students is the maximum appearing from the two shifts. Basically if 3 lacs appeared in Jan and 3.1 will appear in April, your rank will be out of 3.1 lac students and not 3 lacs. That is the reason they haven't revealed the rank after JEE mains Jan and so have decided to release the rank after JEE mains April. They won't combine your rank or anything from the two shifts. This is what I can guess with logic as of now :P

- 1 year, 8 months ago

That implies, Most probably my rank would degrade :P

- 1 year, 8 months ago

Your best percentile will be taken from the two shifts. AIR will depend on the number of students appearing for JEE Mains April, you have time so it's in your hand :P

- 1 year, 8 months ago

If this is really the case then, this is the worst system ever devised for an examination of this scale. Are they treating it as a joke or what :O BTW, I won't even appear for April JEE Main :P

- 1 year, 8 months ago

Really. You are correct. Number of student changes but still :((.... I dont see any intelligent work or mathematics in it

- 1 year, 8 months ago

I guarantee that this system will get removed after 2019

- 1 year, 8 months ago

It seems nonsensical... I mean... two JEEM system is okay... But this percentile normalization is bogus! I mean they set our percentile as per JEE Mains Jan version and then they use it for JEE Mains April(Where no. of studs are diff..), Now we are ahead of certain amount of students which gives us our percentile. What is the guarantee that our percentile wont increase if more students gave? It might be that the extra students who are giving are not giving JEE seriosuly!! Isnt it?

- 1 year, 8 months ago

I really couldn't care less.

- 1 year, 8 months ago

Just ended my journey of Physics olympiads.... My score in INPhO - 41.5 Cutoff - 42

- 1 year, 7 months ago

Arreehhh!!! How is dat possible!!!

- 1 year, 7 months ago

Tamyojit ero tai Bad luck I cannot accept this :(

- 1 year, 7 months ago

Ik... Ekdom same.. tui tamajit er ta ki kore janli?

- 1 year, 7 months ago

North Kolkata fiitjee toh ami, bondhura bollo.

- 1 year, 7 months ago

Oro dukkho hoyegache ? :(

- 1 year, 7 months ago

Obviously.... dukkho nahole he is a robot not a human being. Jemon ami ei bochor KVPY miss korlam by 0.5 marks :(... Just a very sad ... very sad life... Amar AIM oitai chilo.. ki crack KVPY ... to gain some confidence .. karon i have 0 self confidence...

- 1 year, 7 months ago

My self confidence is in negatives then. What about Aaron Jerry Ninan ?

- 1 year, 7 months ago

Just tag hin to ask. And no... You know u r far more better than me.. still ur making fun of me.. JEEM Percentile says all

- 1 year, 7 months ago

Confidence is relative to the viewer na.....

- 1 year, 7 months ago

:p What?

- 1 year, 7 months ago

--------__--------

- 1 year, 7 months ago

Such talented people! Much wowww :O btw you all are just increasing my notifications lol!!

- 1 year, 9 months ago

Newspaper e naam beriyeche. Telegraph page 5. Also in anada bazaar. but percentile given there is bit incorrect (:((()

- 1 year, 9 months ago

Whoa congrats bro!

- 1 year, 9 months ago

Arre... Congrats er kichui nei. Tumi Aakash r porle tomar naam second e hoto :P

- 1 year, 9 months ago

Dekhlam Tor naam! Tamyojit fiitjee r student na? P.S - Don't use "Tumi"

- 1 year, 9 months ago

Hya Tamajit amar schoolei pore. Oke bhalo bhabei chini. Khub brilliant :)

- 1 year, 9 months ago

Yes Fiitjee north kolkata r student ra bole je o ar Angikar khub bhalo

- 1 year, 9 months ago

Woahhhhh! Congratulations !!!!!!!!!!!!!!!! I didn't see the newspaper today but will see it right now. It's your day today:P Proud of you!!!!!!!!!!!!!!!!!!!!!!!

- 1 year, 9 months ago

@Md Zuhair Bro :''''''''''"""'"""""""""((((((((

- 1 year, 8 months ago

@Md Zuhair Bro see what I found https://epaper.telegraphindia.com/calcutta/2019-01-25/71/Page-5.html

- 1 year, 8 months ago

@Md Zuhair Bro yyyyyyyyyyyyyyyy^(infinity) didn't you reply? -----__-----

- 1 year, 8 months ago

Sorry... Extremely .... My bad. Thanks for congrats.

- 1 year, 8 months ago

-----------___-----------

- 1 year, 8 months ago

Arre sorry sorry. Telegraph, ABP, Bartaman sobei diyechilo i guess... Well thanks :). But there's a lot left! :(

- 1 year, 8 months ago

Definitely there's alot left and I am sure you will rock it in them as well :P Kill it like always xD

- 1 year, 8 months ago

Now dont make fun of me :P. I really couldnt do good in JEEM 2019 like my friends who use to score similar marks in All India test series.... Still i am thankful to god for what i got :) ...

- 1 year, 8 months ago

I am not making fun of you -_- How can I make fun of such a talented person? And why are you comparing yourself with your friends? I still remember how you were once giving me advice on not comparing xD

- 1 year, 8 months ago

:P .. O ... Ok.. lets see

- 1 year, 8 months ago

I know you'll rock it all :P My predictions work you see xD

- 1 year, 8 months ago

Yeah, you should be thankful and grateful! Now look forward to Boards and JEE Ad, you need to rock it there as well :P Study hard!

- 1 year, 8 months ago

@Md Zuhair @Rahil Sehgal - Can you please add me to the group too?

- 3 years, 5 months ago

You can comment your contact number below. Thanks.

- 3 years, 5 months ago

- 3 years, 4 months ago

What kind of group is it ? Formal one for physics and math problems ?

- 2 years, 1 month ago

Kind of.....

- 2 years, 1 month ago

Ohh okay!

- 2 years, 1 month ago

Quora misses you bro ;) How's your studies going? Also, tell me how are you motivating yourself everyday? And not to forget only one day left for this year to end LoL xD

- 1 year, 9 months ago

Well lets see... :)

- 1 year, 9 months ago

Okay study harder bro!

- 1 year, 9 months ago

Happy New Year!

- 1 year, 9 months ago

Happy new year!!!!

- 1 year, 9 months ago

@Md Zuhair You used Quora from another account LOL xD There was no point in deactivating your own account then LOL ... This is so funny! Also, do you really know Prakhar Bindal? You yourself answered that question, right? The writing pattern was similar to yours. And study hard for Boards, All the best!

- 1 year, 8 months ago

Haha... I opened it after JEE na... so it had point.. As i used to read how others gave the exam and what answer keys were faulty by NTA. After that i deleted it a few days ago i guess.. I deleted the account. And Yes... I know prakhar bindal persoanlly... and i didnt knew i was so famous :P..... Well.... Akhon abar shob deleted... Chap nei... chere diyechi oi shob :P...

- 1 year, 8 months ago

LOL you can definitely use it whenever you want to :P Haha you're so famous already xD

- 1 year, 8 months ago

Where am i famous? Rastai nijer family member e chinte pare na... They avoid me i guess...(Bhabe... er kache gele amar cheleo fail o korbe..:PP. )

Well... i took decision of deleting it again as i had the similar experience as i had with the previous one. So i deleted this also. I guess will open after JEE agian.

- 1 year, 8 months ago

Eto bhaat keno -- nijer family o Cheney na seriously STOP -- It's okay open it whenever you want to, no one will force you it's your life , you have the freedom to do whatever you want to LOL

- 1 year, 8 months ago

Arre.. :P Moja korchilam.... Ar ami nijer eacche tei bondho korechi.. emnio onno keo bolle ami mantam na... Jokhon nijei mone hoy onek hoye geche.. so stop

- 1 year, 8 months ago

That's great :P I can see how super famous you're going to be :O

- 1 year, 8 months ago

Uriye nao moja :P

- 1 year, 8 months ago

So now study hard and again come on the newspaper! Not joking this time :P All the best!

- 1 year, 8 months ago

First duto line seriously hojom hochchena -__- Heights of sarcasm xD I will be too deleting my account soon, will be back on July because I have my finals on June. Till then you'll be super famous, your name again on the newspaper :P Ar koto famous keu hote pare :P

- 1 year, 8 months ago

Moja uriye dile.... :P...

- 1 year, 8 months ago

What what everyone is becoming famous? We are washing clothes in our house :P

- 1 year, 7 months ago

LOL define the domain of everyone!! Btw how was the physics paper? I got some mail from you regarding the physics paper. Good to see you back on Brilliant after a long time. Also do you know that Brilliant has deleted it's Slack Team?

- 1 year, 7 months ago

LOL that wrong mail went to everyone, I misclicked some link and it has gone perhaps everyone and even modi:P My paper was good :P

- 1 year, 7 months ago

LOL that is what I was wondering :P I mean how can your physics paper go bad?! Brilliant students don't ask for being lenient :P

- 1 year, 7 months ago

No no, tragedies did happen in the maths paper 2-3 years ago, even Brilliant bros were crying.

- 1 year, 7 months ago

Yeah I know but usually such links are fake . And CBSE will definitely take measures if something really goes wrong.

- 1 year, 7 months ago

Around 60,000 students have signed the petition since tuesday!! World record.

- 1 year, 7 months ago

This is how I got to know all this:

• Physics exam finishes, paper goes well.
• I See unpleasant and unhygienic faces in the room.
• Signs petition bcoz marks to mujhe bhi chahiye :P

- 1 year, 7 months ago

This really happens almost every year. Some people create more mess and chaos regarding this. Conclusion : No one trusts the education system of our country, sad reality. No one knows who to be blamed for the paper going bad, students for not studying or CBSE for making an unusual paper.

- 1 year, 7 months ago

Myne went ok. i can say.. :( .... Not tht good... Even our Brilliant topper Ankit Kumar Jain said that he faced certain difficulty.

Btw, @Swapnil Das... How was your JEEM?

- 1 year, 7 months ago

Your "not that good" means above 90% :P Like your "zero confidence" means high level confidence! Such an exception :O

- 1 year, 7 months ago

What?! When did that happen :P ?

- 1 year, 7 months ago

When results will come out you'll know it all :P All the best!!

- 1 year, 7 months ago

Hey were you CBSE? How are marking done? Do we get more than the expected marks or less?

- 1 year, 7 months ago

Are you still adding students ? BTW I'm a JEE aspirant and I'm quite new to brilliant(Using it just for 1-1.5 months)

- 1 year, 9 months ago

+919903607651

- 1 year, 9 months ago

no bro... actually i deleted Whatsapp 6-7 month before :P

- 1 year, 9 months ago

Me too , thats my mom'd :p Btw , we can be friends !

- 1 year, 9 months ago

Obviously. Friends with toppers like you would be a nice thing Id love to

- 1 year, 9 months ago

What do you mean by "topper" ? -_- Do you even know me ?

- 1 year, 9 months ago

- 1 year, 9 months ago

That's nothing much I guess :p I see you are in South Point! I stay in Kolkata(30kms from it though) too ! I am in North Kolkata Fiitjee.

- 1 year, 9 months ago

Arre... Then I know you. I have a friend named Rishav Dugar. He said the you are the smaller version of Arka Das. So I know you that you are a topper!!!

- 1 year, 9 months ago

:( Unfortunately people think that . I am nowhere close to him .

- 1 year, 9 months ago

But u defeat him in some exams.

- 1 year, 9 months ago

Defeat"ed" in some .My Exam temperament is completely broken , nowadays :(

- 1 year, 9 months ago

https://brilliant.org/problems/too-many-lenses/?ref_id=1559097

- 1 year, 9 months ago

I tried it this way. Taking the lens to be thin. I found the number of lens it will overcome until it reaches 3.925cm . Now taking the equivalent of all those lenes we ge the point where the ray would have passed if there were no further lens cutting the principal axis (focal pt) . Ebar....Using perpendicular/base.... =Tan theta(theta is angle b/w ray and principal axis). We can find out the height. If I am wrong somewhere.... Plz correct me. My answer is not matching.

- 1 year, 9 months ago

@Richeek Das @Md Zuhair bro could/can you solve this ? https://brilliant.org/problems/tetrahedron-impedance-planar-network-what-is-the-2/. If so, are you using the standard approach to solve this? Or there's any trick?

- 1 year, 8 months ago

@Nashita Rahman No i dont have them even in the 'saved' section. :(

- 1 year, 8 months ago

- 1 year, 8 months ago

It seems impossible to get them back i guess :((((.... I had a set with doubts which I had to ask to my teachers.. Its lost!

- 1 year, 8 months ago

Please don't start crying :P I know it's sad but what can you do now? Just mail the brilliant staff regarding this as simple as that !! And how are you? All is well? XD

- 1 year, 8 months ago

All is well nahi,Aaal iz well :P... Well.. I Lets see, Prep going on(Mostly Boards)

- 1 year, 8 months ago

You had to bring "3 idiots" in between :P ... Good luck with your prep and keep going, you're doing well.

- 1 year, 8 months ago

Thats my fav. film. After that, I got Inspiration to do Engineering as i found machines impressive and interesting. And that inspiration is working now also... Lets see where this inspiration ends me up

- 1 year, 8 months ago

Yeah I know that it's you fav film :P (You've mentioned it somewhere) .... That's really awesome. Inspiration always leads to something great, I am sure you'll end up doing something great.

- 1 year, 8 months ago

They didn't reply and Calvin Lin said that he has left Brilliant.

- 1 year, 8 months ago

WHAT!! Calvin left!

- 1 year, 8 months ago

SERIOUSLY -_- CALVIN SIR CANNOT LEAVE :""""'(

- 1 year, 8 months ago

They will reply, in like two days. Usually Karen Sir replies. Are you sure Calvin Sir left? :'''''(

- 1 year, 8 months ago

UUUUUUUUUUU MUST BE MISTAKEN he hasn't left Brilliant!!!!! I just checked it. Who told you he left Brilliant?

- 1 year, 8 months ago

No no no no !!!!!!!!!!!!!!!!!!!!!! HE has not left brilliant ! Man!

What he replied : "Hi,

I am out of the office. For YouTube and sponsorship matters, please email Tara Kappel at tara@brilliant.org. For anything else, please email eli@brilliant.org and cc me.

Thanks."

I am extremely sorry!!! I really don't know why I said that "he has left Brilliant". I really really don't know !!!! Seems like I was high.

I am sorry

- 1 year, 8 months ago

Topper like you go high after getting into IIT. One of our sir from Aakash is from IITKGP Mechanical. And he said.... CS waalo sab se zyada high rehta hai.... As they have really tough assignments and tough work... So they go high for some time

- 1 year, 8 months ago

HAHAHAHAAAAHAAAA !!! If this is the reason for going high tab toh bach ke raho CS waalo se :P Not to forget, you're also a topper toh :P

- 1 year, 8 months ago

I MUST SAY THAT YOU BELONG TO JUPITER! People or rather aliens from Jupiter go high like this. Happy journey and stay on EARTH.

Jokes Apart, you should be sorry -_- . Calvin sir is one of the most important part of Brilliant, he can never ever leave brilliant. I am here on brilliant since six years though not really an active member but I have seen tremendous contributions of Calvin sir to Brilliant.

- 1 year, 8 months ago

Different level of highness

- 1 year, 8 months ago

Yes I know that too ! He has made huge contributions to Brilliant ! Sorry ! I apologise :(

- 1 year, 8 months ago

It's okay! No worries.

- 1 year, 8 months ago

Not highness but my sense of humour which is poor!

- 1 year, 8 months ago

Hey.... We know that at freezing point.... The liquid is in equilibrium with the freezed solid. How can we calculate how much water has freezed?(Random qs.... It just came to my mind..... Idk :P)>> is it the same way we do for others... Like we need alpha and K?

- 1 year, 8 months ago

In case of pure water, the whole of it will convert into ice at its freezing point. If there is any impurity in the water then the amount that has freezed can be calculated using Kf provided del Tf ( which says whether the freezing point has decreased/increased) is given. I hope it is clear?

- 1 year, 8 months ago

Ya, But why do we say there's a dynamic equilibrium if whole of the pure water converts?

- 1 year, 8 months ago

At freezing point, water starts to freeze then the temp will change only when whole water is converted to ice. Water freezes at the same rate as ice melts that's why there's a dynamic equilibrium . In my previous comment, I wrote that whole of it will convert into ice at freezing point was a mistake, sorry.

- 1 year, 8 months ago

Who will create the INO 2019 PAGE????

- 1 year, 8 months ago

@Aaron Jerry Ninan How was your INPhO 2019 ? Did you get through ?

- 1 year, 7 months ago

@Md Zuhair Yes I am from CBSE board, the marking is alright but getting above 95 isn't easy at all!!! If you've solved the ten years questions then you must be knowing the question pattern . I can't say whether you'll get more or less than your expected marks because it depends on many factors like who will check your paper, a strict/lenient teacher and all other factors. Just study hard and give your best!

- 1 year, 7 months ago

Ok. But what happened with you? More than expected or less?

- 1 year, 7 months ago

Congratulations!!! @Md Zuhair And all the best for JEE Advanced!!

- 1 year, 5 months ago

for what? -_-

- 1 year, 5 months ago

What else can it be? -----_-----

- 1 year, 5 months ago

Still 262 te 99.7 percentile seems underrated

- 1 year, 5 months ago

No comments. I am seriously not going to judge your marks and say whether it's underrated or not.

- 1 year, 5 months ago

-_-... Anyways... I guess I can apply for IISc as per last year's cutoff. But I won't be applying as I don't want to study basic science anymore after missing KVPY by just 2 marks :(

- 1 year, 5 months ago

You missed KVPY by two marks :"""( That's sad, but it's okay, you still have other good opportunities in hand . Rock it in JEE Advanced xD What will you pursue? Engineering?

- 1 year, 5 months ago

I guess yes. Engineering. :) .. preference wise... CSE,MnC,ECE,EE. (MnC is mathematics and Computing)

- 1 year, 5 months ago

All the best!

- 1 year, 5 months ago

@Md Zuhair All the best !

- 1 year, 5 months ago

Lol.... Tokeo all the best... Can u help me in one of ur qs?

- 1 year, 5 months ago

That solubility of Ag3PO4 ta... How to approach that bujhte parchi na

- 1 year, 5 months ago

Why are you loling -_- Hint : Use POAC for [PO4 3-] (initial) and overall and find the phosphate ion concentration roaming around in the solution...

PO4 3- + H2O ---> HPO4 2- + OH- . . . I guess you know that approach.

- 1 year, 5 months ago

Heyy! How did you perform in JEE? What's your AIR? @Richeek Das

- 1 year, 5 months ago

Don't even ask :( ........Screwed with AIR 497:(

I didn't appear for April one so i guess that might be the case :(

- 1 year, 5 months ago

WOWWWWWW CONGRATS !!! IF YOU'RE NOT HAPPY WITH AIR 497, I REALLY HAVE NOTHING TO SAY -_-

- 1 year, 5 months ago

Tbh, I never cared about JEE Mains, so I don't care about it even now :/

P.S : The rank is bad.

- 1 year, 5 months ago

LOL why didn't you care about JEE ? Do you have any other career plan ? Also, trust me AIR 497 is an amazingly amazing rank, you should definitely be proud of yourself, it's an achievement. Once again, congrats!! All the best for JEE ADVANCED!

- 1 year, 5 months ago

I didn't care about Jee main*(You can also read "I hate JEE Main). Thanks though :)

Advanced is my target and KVPY was my target.

- 1 year, 5 months ago

LOL calm down and don't hate JEE please, hatred is too heavy xD How did you do in KVPY? What will you pursue? Rock it in Advanced xD

- 1 year, 5 months ago

he rocked KVPY also... although he will go for CSE i am sure

- 1 year, 5 months ago

i got 92% in boards btw :P

- 1 year, 5 months ago

WOW! PROUD OF YOU LIKE ALWAYS! Congratulations once again :P

P.S. I have final exams from 3/6/19, I am going offline for 2 months. Hopefully I will survive without internet :"""(

- 1 year, 5 months ago

Congratulations ! How are you so sure that I will pursue CSE -_- . I love physics a lot more than CSE. Tbh -

+I don't know whether I can live with little or no social life in IISc :/

+Literally everyone will force me to join IIT if I manage to get one :/

I will discuss with some IISc students about their lives in there and then I will decide.

P.S - My parents won't force me ever.

- 1 year, 5 months ago

Ok.. but most of the cases.. I see KVPY SX toppers or even qualifiers go for IIT .. and you will get to learn physics in ECE or EE.. so you can take that up.. because thats based upon physics totally... CSE is kind of something else ..... not what we did for JEE till 12th.. but its something very different

- 1 year, 5 months ago

@Md Zuhair I will either go for CSE(if i get it) or IISc(for physics).

- 1 year, 5 months ago

Oh.... but why CSE?

- 1 year, 5 months ago

@Md Zuhair Because I like both physics and CS. Mane janina, ki bolte chaichi. Chaar bhai, agey toh Advanced hok XD

- 1 year, 5 months ago

tui ISI diyechilis re?

- 1 year, 5 months ago

Nope, amar dara maths hoyna

- 1 year, 5 months ago

H ac ha -_-

- 1 year, 5 months ago

- 1 year, 2 months ago

we are not in that group anymore :)

- 1 year, 2 months ago

Ooo.. ankit jain was in that group ?

- 1 year, 2 months ago

Yep, now no more group

- 1 year, 2 months ago

Any new group ?

- 1 year, 2 months ago

Bhai eta try kortoh... tell me if the answer is correct

https://brilliant.org/problems/600000-points-problemfor-jee19/?ref_id=1569043

- 1 year, 5 months ago

Bapre pore korbo

- 1 year, 5 months ago

Hey zuhair, we have isi interview on the same day... 18th June... I wanted to know.... How many subjectives did you solve in the UGB?

- 1 year, 4 months ago

ohkay....i solved 4.5 qs at UGB and got 97/120 in UGA

- 1 year, 4 months ago

- 1 year, 4 months ago

Oh... So I've enrolled in "cheenta" they are providing mock interviews ...i know it's quite unnecessary but still I don't want to leave a chance.

- 1 year, 4 months ago

And yes I didn't pay full fees The full fees included written exam preparation. I paid only for mock interviews

- 1 year, 4 months ago

- 1 year, 4 months ago

https://brilliant.org/problems/isi-interview/

- 1 year, 4 months ago