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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%`

Text Solution

Verified by Experts

`lambda=(hc)/(eV)`, `(lambda_(1))/(lambda_(2))=(v_(2))/(v_(1))`, `lambda_(2)=(3)/(4)lambda_(1)`
`v_(2)=(4)/(3)v_(1)` (which is equal to `(100)/(3)%`increase)
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