College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

تمرين 65

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.). What is the speed of the truck (Take the speed of sound in air to be 343 m/s.)

FIGURE The siren's wail See Exercise.