Question

The energy level of a certain atom for 1^st; 2^nd and 3^rd level are E, $\frac{4E}{3}$ 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. $\frac{\lambda}{3}$
• B. $\frac{4\lambda}{3}$
• C. $\frac{3\lambda}{4}$
• D. 3l

Answer 1

Answer: (D)

3l

Answer 2

……. 2E

…… $\frac{4E}{3}$

……..E

2E – E = $\frac{hc}{\lambda}$ …(1)

$\frac{4E}{3}$ – E = $\frac{hc}{\lambda'}$…(2)

l' = 3l