Question

The energy levels of a certain atom for 1^st, 2^nd and 3^rd levels are E, 4E/3 and 2E respectively. A photon of wavelength l is emitted for a transition 3 ® 1, What will be the wavelength of emission for transition 2 ® 1?

• A. l/3
• B. 4l/3
• C. 3l/4
• D. 3l

Answer 1

Answer: (D)

3l

Answer 2

2E – E = E = $\frac{hc}{\lambda}$

$\frac{4E}{3}$ – E = $\frac{E}{3}$ = $\frac{hc}{\lambda'}$

l¢ = 3l