Nuclear Physics And Radioactivity Question 26
Question: In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be [MP PMT 1994]
Options:
A) $ 3.4\times {{10}^{-27}}N\text{-} $ sec
B) $ 6.8\times {{10}^{-27}}N\text{-} $ sec
C) $ 3.4\times {{10}^{-24}}N\text{-} $ sec
D) $ 6.8\times {{10}^{-24}}N\text{-} $ sec
Show Answer
Answer:
Correct Answer: B
Solution:
Recoil momentum = momentum of photon $ =\frac{h}{\lambda } $ $ =hR( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} ) $ $ =\frac{hR\times 15}{16}=6.8\times {{10}^{-27}}N\times \sec $
BETA
