Answer is: the energy of exactly one photon of this light is 4.75·10⁻¹⁹ J. Photon energy equation: E = h·ν. E - energy of one photon. ν- frequency. h - Planck's constant. ν = 7.17·10¹⁴ Hz. h = 6.63·10⁻³⁴ J·s. E = 6.63·10⁻³⁴ J·s · 7.17·10¹⁴ Hz. E = 4.75·10⁻¹⁹ J.
