First slide

X-rays

Question

The graph that correctly represents the relation of frequency v of a particular characteristic X-ray with the atomic number Z of the material is

Easy

A
B
C
D

Solution

$\begin{array}{l} By Moseley' s law, \sqrt{v} = a (Z - b) or, v = a^{2} {(Z - b)}^{2} \\ Comparing with the equation of a parabola y^{2} = 4 ax it conforms to graph 3 . \end{array}$

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