Question
You are at a street corner and hear an ambulance siren. Without looking, how can you tell when the ambulance passes by?
Step 1
Pay attention to the pitch and volume of the sound. Show more…
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When an ambulance is moving toward you, you hear its siren at 12.3 kHz. When it is moving away from you, you hear its siren at 10 kHz. How fast is the ambulance moving, and what frequency is an ambulance siren at rest?
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