Question

Frequency of ${\text{K}}_{\alpha }\text{X}-$ rays of different materials are measured. Which graph in figure represent the relation between frequency $\left(\nu \right)$ and atomic number $\left(Z\right):$

• A. $\left(3\right)$
• B. $\left(1\right)$
• C. $\left(4\right)$
• D. $\left(2\right)$

Answer 1

The correct option is C $\left(4\right)$

From Moseley's law,

$\sqrt{\nu }\propto Z$

$\Rightarrow \nu \propto Z^2$

$\Rightarrow \nu =k{Z}^2$ $(k$ is constant $)$

So, the graph will follow a parabolic curve as given below.


Hence, option $\left(\text{C}\right)$ is correct.