Chemistry

Problem

An He

^{+}

ion (

Z = 2

) emits a photon when its electron jumps from the

n_i = 4

state to the

n_f = 2

state. a. (a) Calculate the wavelength of the emitted photon. b. (b) Hence determine its frequency and energy. c. Take

R_H = 1.097 \times 10^{7}\,\text{m}^{-1}

h = 6.63 \times 10^{-34}\,\text{J s}

and

c = 3.00 \times 10^{8}\,\text{m s}^{-1}