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To decrease the cut-off wavelength of co...

To decrease the cut-off wavelength of continuous `X-ray` by `25%`, the potential difference across the `X-ray` tube

A

must be increased by `100/3` %

B

must be decreased by 20%

C

must be increased by 25%

D

must be decreased by 25 %

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The correct Answer is:
A
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