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Solid targets of different elements are bombarded by highly energetic electron beams. The frequency of the characteristic X-rays emitted from different target varies with atomic number Z as ......

A

`f prop sqrt(Z)`

B

`f prop Z^(2)`

C

`f prop Z^(-2)`

D

`f prop Z^((3)/(2))`

Text Solution

Verified by Experts

The correct Answer is:
B
According to Moseley.s law,
`(Z- sigma) prope sqrt(f) or f prop (Z-sigma)^(2)`
Note : The correct answer should have been `fprop (Z-sigma)^(2)`, where `sigma` is the screening constant.
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