A) \[1.2\overset{o}{\mathop{\text{A}}}\,\]
B) \[10.5\overset{o}{\mathop{\text{A}}}\,\]
C) \[100\overset{o}{\mathop{\text{A}}}\,\]
D) \[1000\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
Here: Potentiel difference \[V=100\text{ }V\] We know that de Broglie wavelength of an electron is given by as \[\lambda =\frac{h}{\sqrt{2q\,Vm}}\] \[=\frac{6.6\times {{10}^{-34}}}{2\times (1.6\times {{10}^{-19}})\times 100\times 9.1\times {{10}^{-31}}}\] \[=1.2\times {{10}^{-10}}m=1.2\,\overset{o}{\mathop{\text{A}}}\,\]
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