Three charges (Q1=-3uc, Q0=1uc, Q2=1uc) are located at fixed positions as indicated in the right figure. a) find the total electrical force on the charge Q0 at the origin. b) find the magnitude of the total force on this charge.

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.