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Question

Find out voltage applied to an electron microscope to produce electron of wavelength $0.6 ˚ A$

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Solution

Wavelength of electron $λ (i n A^{o}) = \frac{12.27}{\sqrt{V}}$
So, $0.6 = \frac{12.27}{\sqrt{V}}$
$⟹ V = 4.5 V o l t s$

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