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(B) According to Moseley's law,the frequency $(f)$ of the characteristic $X-$rays emitted from a target is given by the relation:$f = a(Z - b)^2$where

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$f \propto Z^2$

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(B) According to Moseley's law,the frequency $(f)$ of the characteristic $X-$rays emitted from a target is given by the relation:$f = a(Z - b)^2$where $a$ and $b$ are constants depending on the specific series of $X-$rays (e.g.,$K_{\alpha}, L_{\alpha}$).For high atomic numbers $(Z)$,the term $b$ becomes negligible compared to $Z$.Therefore,the relationship simplifies to:$f \propto Z^2$Thus,the frequency of characteristic $X-$rays is proportional to the square of the atomic number $(Z)$.

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

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