Question: The electric bells at your school buzz with a frequency of (400 mathrm{~Hz}). If you are late for class and riding your bike down a

The electric bells at your school buzz with a frequency of $400 \mathrm{~Hz}$. If you are late for class and riding your bike down a hill toward the school at a constant speed of $4.47 \mathrm{~m} / \mathrm{s}$, what is the frequency of the sound you hear?

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