The follwing diagram indicates the energy levels of a certain atom when the system moves from `2E` level to `E`, a photon of wavelength `lambda` is emitted. The wavelength of photon produced during its transition from `(4E)/(3)` level to `E` is

Answer

`(lambda)/(m)`

Explanation

`1/3 E=(hc)/lambda=lambda=(3hc)/E` when `E'=E, lambda'=(hc)/E=lambda/3`
So new wavelength `=lambda/3`