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Question

An electron has kinetic energy 2.8×1023J de-Broglie wavelength will be nearly me=9.1×1031kg


A

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C

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Solution

The correct option is C


Formula for de-Broglie wavelength is

λ=hpOrλ=hmveV=12mv2orv=2eVm


λ=h2meV= 6.62×10342×9.1×1031×2.8×1023

λ=9.28×108meter.


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