1.

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 ......

Answer»

`F prop sqrt(Z)`
`f prop Z^(2)`
`f prop Z^(-2)`
`f prop Z^((3)/(2))`

Solution :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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