# Quantum Tunneling

Hi, I am new to Quantum Mechanics. I had a query and wanted to share with you all. I was recently studying the subject of quantum barrier tunneling. It says there is always some probability for electron to pass a potential barrier even though it doesn't have sufficient energy to cross the potential barrier. The more interesting thing about this is that the energy of electron after crossing the barrier remains same. I doubt it. Look think it in this way that its possible for the electron to travel half the barrier and then cross it. Then it would have less energy after crossing the barrier. But to my knowledge nobody had seen it though. What might be the reason that such phenomenon don't occur?

Note by Lokesh Sharma
5 years, 9 months ago

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- 5 years, 9 months ago

Thank You :)

- 5 years, 9 months ago

E=T+V.

- 5 years, 9 months ago

Average energy is conserved. So when it crosses over the barrier,some of the energy is stored in form of potential energy.Of course what does decrease is the average kinetic energy. :) So you can say by energy you meant Kinetic energy in the question.

- 5 years, 9 months ago

Yes, by energy in the question I meant kinetic energy. It gains potential energy only when it is inside the barrier. When it is outside the barrier it cannot have energy stored in form of potential energy!!!

- 5 years, 9 months ago