Question

What is the wavelength of light (in m) emitted by a hydrogen atom when an electron relaxes from the 5 energy level to the 3 energy level?

Answer 1

1/     = RH(1/n1^2 - 1/n2^2)

RH   = 109678cm^-1

n1 = 3

n2 = 5

1/     = 109678(1/(3)^2 -1/(5)^2)

1/    = 109678(1/9 -1/25)

1/    = 109678(0.11-0.04)

1/      = 7677.46

           = 1/7677.46   = 0.00013cm   = 1.3*10^-4cm

            = 1.3*10^-6 m >>>>answer