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Is it based on wavelength knowledge??

A near UV photon of 300 nm is absorbed by a gas and then re-emitted as two photons. One photon is red with wavelength of the second photon is

Note by Tanishq Varshney
2 years, 11 months ago

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Apply energy conservation $\frac{hc}{300 nm} = \frac{hc}{\lambda_{red}} + \frac{hc}{\lambda}$

- 2 years, 11 months ago

Yes, you have to know the wavelength distribution between colours in order to get this problem right.

- 2 years, 11 months ago