Question

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 5 to an energy level with n = 3?

Answer 1

using formula we get

1/lambda=R(1/9-1/25)
=109677*0.071
1/lambda=7787.06 cm^-1
lambda=1.28*10^-4 cm