The buoyant force on a submerged boulder acts upward because

equal water pressures act on all sides

water is denser at the bottom of the boulder

it is easier to lift when submerged

greater water pressure acts on the bottom than on the top

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.