An electron changes its position from orbitn = 4 to n = 2 of an atom. Wavelength of the emitted radiation is :(R-Rydberg's constant)

Options

A. `16/R`
B. `16/(7R)`
C. `16/(5R)`
D. `(16)/(3R)`

Answer

D

Explanation

`1/lamda=R[1/n_1^2-1/n_2^2]=R[1/2^2-1/4^2]=(3R)/16 " ":. lamda=16/(3R)`