A beam of unpolarized visible light is incident on a polarizer with its axis vertical. It is followed by a second polarizer with its axis at 300 to the vertical. The second polarizer is followed by a third polarizer with its axis at 800 to the vertical. What is the input intensity if the output intensity is 100W/m2 .

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.