The wavelength of `K_(alpha)` line from an element of atomic number 41 is `lamda`. Then the wavelength of `K_(alpha)` line of an element of atomic number 21 is :

Options

A. `4lamda`
B. `(lamda)/(4)`
C. `3.08lamda`
D. `0.26lamda`

Answer

A

Explanation

`(lambda_(2))/(lambda_(1))=((Z_(1)-1)^(2))/((Z_(2)-1)^(2))=((40)/(20))^(2)=4`