<P> E = h ν (\ displaystyle E = h (\ nu)) </P> <P> is used where h is Planck's constant and the Greek letter ν (nu) is the photon's frequency . </P> <P> An FM radio station transmitting at 100 MHz emits photons with an energy of about 4.1357 × 10 eV . This minuscule amount of energy is approximately 8 × 10 times the electron's mass (via mass - energy equivalence). </P> <P> The highest energy gamma rays detected to date, very - high - energy gamma rays, have photon energies of 100 GeV to 100 TeV (10 to 10 electronvolts) or 0.016 microjoules to 0.016 millijoules . This corresponds to frequencies of 2.42 × 10 to 2.42 × 10 Hz . </P>

Calculate the energy in ev of an ir photon of frequency