Nuclear Physics And Radioactivity Question 111
Question: In hydrogen atom, electron makes transition from n =4 to n = 1 level. Recoil momentum of the H atom will be
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:
[b] Recoil momentum = momentum of photon $ =\frac{h}{\lambda } $ $ =hR( \frac{1}{n^{2}{1}}-\frac{1}{n^{2}{2}} )=\frac{hR\times 15}{16}=6.8\times {{10}^{-27}} $ N-sec
BETA
