The siren of a police car at rest emits at a predominant frequency of 1980 Hz. What frequency will you hear if you are at rest and the police car moves at 34.3.0m/s (a) toward you, and (b) away from you? Please Explain
applying doppler's effect for source approaches to the observer
f = fo v / ( v - vs)
f = 1980* 343 / ( 343 - 34.3)
f = 2200 Hz
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similary when source moves away from stationary observer
f = 1980 * 343 / ( 343 + 34.3)
f = 1800 Hz
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The siren of a police car at rest emits at a predominant frequency of 1980 Hz....