When an electron in an excieted 'Mo'atom falls from 'L' to 'K' shell , an X-ray is emitted.... These X-rays are diffracted at one angle of `7.75^(@)` by planes with a separation of `2.64A^(@)`. What is the difference its energy between K-shell and L-shell in 'Mo' assuming a first order diffraction.

Options

A. `2.79xx10^(-15)J`
B. `5.48xx10^(-15)J`
C. `5.48xx10^(15)J`
D. `2.76xx10^(15)J`

Explanation

`2d sin theta=n lambda`
`lambda=(2xx2.64xx10^(-10)xx0.1349)/(1)=7.123xx10^(-11)m`
`E=(hc)/(lambda)=2.79xx10^(-15)J`