An atom absorbs a photon of wavelength 500 nm and emits another photon of wavelength 700 nm. Find the net energy absorbed by the atom in the process.
λ1 = 500 nm = 500 x 10–9m, λ2 = 700 nm = 700 x 10–9 m
E1 – E2 = Energy absorbed by the atom in the process. = hc [1/λ1 – 1/λ2]
=> 6.63 x 3[1/5 – 1/7] x 10–19 = 1.136 x 10–19 J
