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Card 16

Front

sound waves that can be reflected.

Back

Card 17

Front

when the wavelength and frequency of the waves detected by the observer shift from the original produced by the source.

Back

Card 18

Front

red shift provides evidence that the universe is expanding. light from distant galaxies. frequency has decreased. Wavelength has increased.

Back

Card 19

Front

radiation produced by the big bang. As the universe expanded higher energy gamma radiation would have become lower gamma energy radiation.

Back