If Z is the atomic number of the target atom, then the frequency of the `K_alpha` line of the characteristic X ray spectrum is directly proportional to

Options

A. Z
B. `Z^2`
C. `Z^(1//2)`
D. `Z^(2//3)`

Answer

D

Explanation

For `K_alpha " line " , 1/lamda = R (Z-1)^2 (1/1^1 - 1/2^2)`
`therefore v prop Z^2`