Question

In Hydrogen-atom what type of radiation is expected to be associated with energy transitions down to n = 3 energy level?

• A. Infrared
• B. Ultraviolet
• C. X-rays
• D. Gamma rays

Answer 1

Answer: (A)

Infrared

Answer 2

For infrared l > 700 nm i.e., wavelength is greater than 700 nm

$\frac{1}{\lambda}$ = $R_{y}\left\lbrack \frac{1}{n_{f}^{2}} - \frac{1}{n_{i}^{2}} \right\rbrack$

n_i =  ; n_f = 3

$\frac{1}{\lambda}$= 1.097 × 10⁷$\left\lbrack \frac{1}{9} - 0 \right\rbrack$

l = $\frac{9 \times 10^{- 7}}{1.097}$

l = 820 × 10^–9 m