A) zero
B) \[\left( \text{given},\text{hc=124}0\text{ eV}-\text{nm},\text{e}=\text{1}.\text{6}\times \text{1}{{0}^{-\text{19}}}\text{ C} \right)\]
C) \[5\mu A\]
D) \[40\mu A\]
Correct Answer: B
Solution :
Force \[=8\times {{10}^{5}}Hz\] mg (when body is rest) When the body starts moving with acceleration a then \[2d\sin \theta =n\lambda \Rightarrow \lambda =\frac{2d\sin \theta }{n}\] \[0\le \sin \theta \le 1\Rightarrow \lambda \le 2d\] \[\varepsilon =\text{v B}\,\text{I}\] \[q=C\varepsilon =CvBi\] \[i=\frac{dq}{dt}=CBI\frac{dv}{dt}=CBI\]
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