The De-broglie wavelength associated with an electron, accelerated through a potential difference V is

1
\(\lambda_c = \dfrac{12.27}{\sqrt V }Å\,\)
2
\(\lambda_c = \dfrac{12.27}{ V }Å\,\)
3
\(\lambda_c = 12.27\times \sqrt V Å\)
4
\(\lambda_c = 12.27\times V Å\)

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