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Question

In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of 7.5×1012 m, the minimum electron energy required is close to

A
1 keV
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B
25 keV
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C
500 keV
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D
100 keV
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Solution

The correct option is B 25 keV
Given:
λ=7.5×1012
We know that,
λ=hPP=hλ

Minimum energy required,
KE=P22m=(h/λ)22m={6.6×10347.5×1012}22×9.1×1031

KE25 keV

Hence, option (D) is correct.

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