7. A photon has a wavelength of 1.5 x 10-12 meters. What is this photon Solution the photon frequency in air or vacuum = c / lambda = 3x10^8 / 1.5 x 10^-12 = 2 x 10^20 Hz The photon energy, E = h * f, where h = Planck\'s constant = 6.63x10-34 [Js]. = 1.326 x 10^-13 J Double check my calculations but I think it should be ok.