Asilver bar 0.125 meter long is subjected to a temperature change from 200 c to 100 c . what will be the length of the bar after the temperature change?
a) 0.00023635 meter
b) 0.124764 meter
c) 0.2363 meter
d) 0.189 meter

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.