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Which of the following situations would cause the greatest change in the observed frequency from the actual emitted frequency of the source? Choose ALL that apply.

A

The source is approaching the stationary observer at 20 m/s.

B

The observer is approaching the stationary source at 25 m/s.

C

The source is ahead of the observer and moving north at 20 m/s while the observer moves north at 25 m/s.

D

The source is behind the observer and moving north at 20 m/s while the observer moves north at 25 m/s.​

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