Dual Nature Of Radiation And Matter Ques 56
56. The $21 $ $cm$ radio wave emitted by hydrogen in interstellar space is due to the interaction called the hyperfine interaction in atomic hydrogen. The energy of the emitted wave is nearly
[1998]
(a) $10^{-17} $ $J$
(b) $1 $ $J$
(c) $7 \times 10^{-8} $ $J$
(d) $10^{-24}$ $ J$
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Answer:
Correct Answer: 56.(d)
Solution:
- (d) $ E=h v=\frac{h c}{\lambda}=\frac{6.6 \times 10^{-34} \times 3 \times 10^{8}}{0.21} $
$=\frac{6.6}{7} \times 10^{-24}=0.94 \times 10^{-24} J$
BETA
