Find the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 x 10-19 J. (a) a photon having a frequency of 6.80 x 1017 Hz ev (b) a photon having a wavelength of 5.00 x 10 nm ev (a) How many minutes does it take a photon to travel from the Sun to the Earth? min (b) What is the energy in eV of a photon with a wavelength of 473 nm? ev (c) What is the wavelength (in m) of a photon with an energy of 1.78 eV? m