You and a friend are riding bikes, you moving at (9.72 mathrm{~km} / mathrm{h}) and she moving

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You and a friend are riding bikes, you moving at \(9.72 \mathrm{~km} / \mathrm{h}\) and she moving at \(7.20 \mathrm{~km} / \mathrm{h}\). She is behind you and turns on her electric horn, which has a frequency of \(300 \mathrm{~Hz}\).

(a) What frequency do you hear?

(b) What frequency is heard by a person who is standing alongside your route after you both have passed him?

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