A) \[1.9\times {{10}^{-10}}\]
B) \[18\,\times \,{{10}^{-19}}\]
C) \[8.2\,\times \,{{10}^{-20}}\]
D) \[18\,\times \,{{10}^{-20}}\]
Correct Answer: A
Solution :
\[\lambda =\frac{h}{\sqrt{2meV}}\Rightarrow \frac{h}{e}=\sqrt{\frac{2mv}{e}}.\lambda \] \[=\sqrt{\frac{2\times 9.1\times {{10}^{-31}}\times 9000}{1.6\times {{10}^{-10}}}}\times 6\times {{10}^{-7}}\] \[=1.9\times {{10}^{-10}}\]
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