Question: When a police car is at rest, its siren has a frequency of 750 Hz. You are a thief, and just after finishing a nights

When a police car is at rest, its siren has a frequency of 750 Hz. You are a thief, and just after finishing a night’s work, you hear a siren with a frequency of 700 Hz. Your fellow thief tells you to relax and assures you that there is nothing to worry about. Is she right?

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