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An observer hears the sound from a source that is emitting a sound at a constant...

An observer hears the sound from a source that is emitting a sound at a constant frequency. In which case will the observer hear the highest frequency sound?

a. The observer is moving at 10m/s toward a stationary source
b. The observer is moving at 10m/s away from a stationary source
c. The source is moving at 10m/s toward a stationary observer
d. The source and observer are each moving at 10m/s away from each other
e. The source and observer are each moving at 10m/s toward one another.

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