Question: A balloon driven by a 36-km/h wind emits a sound of 800 Hz as it approaches a tall building. (a) What is the frequency of

A balloon driven by a 36-km/h wind emits a sound of 800 Hz as it approaches a tall building.

(a) What is the frequency of the sound heard by an observer at the window of this building?

(b) What is the frequency of the reflected sound heard by a person riding in the balloon?

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