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) \[6.8\times {{10}^{-24}}N\text{-}\sec \]
Correct Answer: B
Solution :
[b] Recoil momentum = momentum of photon \[=\frac{h}{\lambda }\] \[=hR\left( \frac{1}{{{n}^{2}}_{1}}-\frac{1}{{{n}^{2}}_{2}} \right)=\frac{hR\times 15}{16}=6.8\times {{10}^{-27}}\] N-sec
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