Energy E = 157 kjmol
We have Avogadro constant Na = 6.023 Ă— 10^23/mol
Planck constant, h = 6.626 Ă— 10^-34 J s
Speed of light, Vl = 3.00 Ă— 10^8 m/s = lambda x V
We have energy E = Na x h x V => E = Na x h x (Vl / lambda)
157 x 10^3 = (6.023 Ă— 10^23 x 6.626 Ă— 10^-34 x 3.00 Ă— 10^8) / lambda
lambda = (6.023 Ă— 10^23 x 6.626 Ă— 10^-34 x 3.00 Ă— 10^8) / 157 x 10^3
lambda = 119.72 x 10^-3 / 157 x 10^3 = 0.76258 x 10^-6 m
Wavelength = 763 nm
