• # question_answer The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly 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 $\overset{\text{o}}{\mathop{\text{A}}}\,$

[c] $\lambda =\frac{h}{\sqrt{2mQV}}=\frac{6.6\times {{10}^{-34}}}{\sqrt{2\times 9.1\times {{10}^{-31}}\times 1.6\times {{10}^{-19}}\times 100}}$$=1.23\,\overset{\text{o}}{\mathop{\text{A}}}\,$