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 :
Recoil momentum = momentum of photon \[=\frac{h}{\lambda }\] \[=hR\left( \frac{1}{n_{1}^{2}}-\frac{1}{n_{2}^{2}} \right)\]\[=\frac{hR\times 15}{16}=6.8\times {{10}^{-27}}N\times \sec \]
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