`A` near ultra violet photon of wavelength `300nm` is absorbed by a gas and then emitted as two photons. One photons is of red light with wavelength `760nm`. What would be the wave length of the second photon?

Explanation

`(hc)/(lamda) = (hc)/(lamda_(1)) + (hc)/(lamda_(2))` this means `(1)/(lamda) = (1)/(lamda_(1)) + (1)/(lamda_(2))`. In other words `(1)/(300) = (1)/(700) + (1)/(lamda_(2))` On solving for `lamda_(2)` we get `lamda_(2)` = 496 nm