Solid targets of different elements are bombarded by highly en ergetic electron beams. The frequency (f) of the characteristic X-rays emitted from different targets varies with atomic number Z as

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According to Moseley's law ( Z − σ ) ∝ f ​ or, f ∝ ( Z − σ ) 2 . Note : The correct answer should have been f ∝ ( Z − σ ) 2 where σ is the screening constant. Many authors use at this level, σ = 1 approximately.

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