The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength. So-called UV-A radiation has wavelengths in the range of 320-380 nm, whereas UV-B radiation has wavelengths in the range of 290-320 nm.
(a) Calculate the frequency of light that has a wavelength of 320 nm.
(b) Calculate the energy of a mole of 320-nm photons.
(c) Which are more energetic, photons of UV-A radiation or photons of UV-B radiation?
(d) The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-A radiation. Is this observation consistent with your answer to part (c)?