Question: While driving down the road, you spot a friend standing on the sidewalk. You honk your horn at him while driving (70 mathrm{~km} / mathrm{h}).

While driving down the road, you spot a friend standing on the sidewalk. You honk your horn at him while driving $70 \mathrm{~km} / \mathrm{h}$. Your horn emits a frequency of $360 \mathrm{~Hz}$. What frequency does your friend hear $(a)$ as you approach and $(b)$ after you pass by?

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