An electron changes its position from orbit n=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)`

Explanation

`(1)/(lamda ) = R [ (1)/( n_(1) ^(2)) - (1)/( n _(2) ^(2)) ]= R [ (1)/( 2 ^(2)) - (1)/( 4 ^(2)) ] therefore lamda = (16)/(3R)`