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(A) Moseley's law states that the square root of the frequency of characteristic $X$-rays is directly proportional to the atomic number $(Z)$ of the t

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$f = a(Z - b)^2$

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(A) Moseley's law states that the square root of the frequency of characteristic $X$-rays is directly proportional to the atomic number $(Z)$ of the target element.Mathematically,this is expressed as $\sqrt{f} = a(Z - b)$,where $a$ and $b$ are constants.Squaring both sides,we get $f = a^2(Z - b)^2$.Since $a^2$ is also a constant,the law is represented as $f = a(Z - b)^2$.

Moseley measured the frequency $(f)$ of the characteristic $X$-rays from many metals of different atomic number $(Z)$ and represented his results by a relation known as Moseley's law. This law is ($a, b$ are constants)

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