When light passes through the universe and is redshifted by the expansion of space itself, how is energy conserved? The stretched light has a longer wavelength and therefore a lower energy. Is energy conserved? If so, where does it go?...

High school teacher Kate Nichols explains that wave energy is equal to the amplitude of a wave. Looks at different scenarios where we may notice that wave energy is being conserved or not. The conversion of wave energy into another type...

It appears that energy is destroyed at the points of destructive interference and created at the points of constructive interference. So, the law of conservation of energy appears to be violated. But this is not correct. The energy is...