Question: what is the energy of a photon of light having a wavelength of 4.5?
Answer: What is the energy of a photon of light having a wavelength of 4.5 x 10-7 meters? (Planck's constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s) 2.9817 x 10-40 joules. 4.4143 x 10-19 joules.