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  4. It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power n i.e. vn of X-rays emitted is plotted against atomic number Z , following graph is obtained.

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Q. It is observed that characteristic $X$-ray spectra of elements show regularity. When frequency to the power " $n$ " i.e. $v^n$ of $X$-rays emitted is plotted against atomic number " $Z$ ", following graph is obtained.Chemistry Question Image

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Solution:

According to Henry Moseley $\sqrt{v} \alpha z - b$
So $n =\frac{1}{2}$