Photons and Colors
Electron volts are useful size units of energy
1 eV = 1.6 x 10-19 Coul * 1V = 1.6 x 10-19 J.
radio photon: hf = 6.63 x 10-34 J*s * 1 x 106 /s = 6.63 x 10-28 J = 4 x 10-9 eV
red photon: f = c/????3 x 108 m/s / 7 x 10-7 m =
4.3 x 1014 Hz, red photon energy = 1.78 eV
blue: ??= 400 nm; photon energy = 3.11 eV .