chrisannedegraff
chrisannedegraff
27.01.2021 • 
Biology

Earth Science Choose the statement about the Doppler Effect that is true
It occurs when a wave source moves towards an observer.
It occurs when an observer moves towards a wave source.
It occurs when a wave source moves away from an observer.
It occurs when an observer moves away from a wave source.
All the above are true

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