NEET-XII-Physics
44: X-rays
- #7Frequencies of Kα X-rays of different materials are measured. Which one of the graphs in the figure may represent the relation between the frequency v and the atomic number Z ?
Ans : Using Moseley's Law,
`` \sqrt{v}=a\left(Z-b\right)``,
where v = frequency of Kα X-ray
Z = atomic number
`` \therefore v={a}^{2}{\left(Z-b\right)}^{2}``
`` \Rightarrow {\left(Z-b\right)}^{2}=\frac{v}{{a}^{2}}``
This is the equation of a parabola with some intercept on the axis, representing atomic number (Z). Hence, curve d represent this relation correctly.
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