Question: A bystander hears a siren vary in frequency from 476 Hz to 404 Hz as a fire truck approaches, passes by, and moves away on

A bystander hears a siren vary in frequency from 476 Hz to 404 Hz as a fire truck approaches, passes by, and moves away on a straight street (Fig. 14.21). What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.)

476 Hz 404 Hz

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