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  4. de-Broglie wavelength associated with an electron, accelerating through a potential difference of 100 V lies in the region of

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Q. de-Broglie wavelength associated with an electron, accelerating through a potential difference of $100 \,V$ lies in the region of

Dual Nature of Radiation and Matter

Solution:

$\lambda=\frac{1.227}{\sqrt{V}} nm =\frac{1.227}{\sqrt{100}}=0.123\, nm$
which is in X-ray region.