InterviewSolution
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InterviewSolution
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Electrons used in an electron microscope are accelerated by a voltage of `25 kV`. If the voltage is increased to `100 kV` then the de - Broglie wavelength associated with the electrons wouldA. decrease by `2` timesB. decrease by `4` timesC. increase by `4` timesD. increase by `2` times |
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Answer» Correct Answer - A We have `lambda = (12.27)/(sqrt(V))` So , `(lambda_(1))/(lambda_(2)) = sqrt((V_(2))/(V_(1))) rArr lambda_(2) = lambda_(1) sqrt((V_(1))/(V_(2)))` `lambda_(2) = lambda_(1) sqrt((25)/(100)) rArr lambda_(2) = lambda_(1) sqrt((1)/(2)) = (lambda_(1))/(2)` |
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