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Question

Hard X-rays for the study of fractures in bones should have a minimum wavelength of 1011 m. The accelerating voltage for electrons in X-ray machine should be



A

<124.2 kV

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B

>124.2 kV

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C

between 60 kV and 70 kV

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D

= 100 kV

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Solution

The correct option is C

>124.2 kV


λmin=hceV=1.242×106V

or V=1.242×1061011

=124.2×103V

=124.2kV


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