Leila drove to the mountains last weekend. there was heavy traffic on the way there, and the trip took 10 hours. when leila drove home, there was no traffic and the trip only took 7 hours. if her average rate was 18 miles per hour faster on the trip home, how far away does leila live from the mountains?

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.