# Following fig indicates energy levels of certain atom. When system moves from 2E to E level a photon of wavelength lambda is emitted. when transition is from 4E/2 to level E then wavelength of emitted photon is?

Arun
25757 Points
4 years ago
Dear student

2E - E = h c /$\lambda$
E = hc/$\lambda$
4E/3 - E = hc /$\lambda$'
E/3 = hc/$\lambda$'
Hence
$\lambda$' = 3 $\lambda$

Regards
Arun (askIITians forum expert)