A) \[100\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[123\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1.23\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[0.123\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
de-Broglie wavelength associated with electron, \[\lambda =\frac{h}{m\upsilon }=\frac{h}{\sqrt{2m{{E}_{K}}}}=\frac{h}{\sqrt{2me}V}\] (for electron, \[{{E}_{K}}=eV\]) \[=\frac{12.3}{\sqrt{V}}\overset{{}^\circ }{\mathop{\text{A}}}\,=\frac{12.3}{\sqrt{100}}\overset{{}^\circ }{\mathop{\text{A}}}\,\] \[=1.23\overset{{}^\circ }{\mathop{\text{A}}}\,\]
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