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To decrease the cut - off wavelength of ...

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%

Text Solution

Verified by Experts

The correct Answer is:
A
`lambda=(hc)/(eV)`,`(lambda _(1))/(lambda_(2))=(v_(1))/(v_(2))`, `lambda _(2)=(3)/(4) lambda_(1)`, `v_(2)=(4)/(3)v_(1), (100)/(3)%` increases.
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