2. suppose a dipole ⃗p is placed in a nonuniform electric field e⃗ = eˆi that points along the x axis. if e⃗ depends only on x and the electric field varies very slowly from the negative to the positive charge in the dipole (2l is the distance between charges in the dipole), show that the net force on the dipole is f⃗ = (⃗p · de⃗ dx )ˆi.

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.