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A fire truck is sounding at 500 Hz as it travels at a speed of 30 m/s. What frequency does an observer hear as the fire truck approaches him? As it moves away from him? Assume v of sound in air to be 340 m/s.​

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Princebernhard48go

Answer:

If the observer were stationary, the time for one wavelength of sound to pass should be equal to the period of the source Ts. Since the observer is moving toward the source, the time for one wavelength to pass is less than Ts and is equal to the observed period To=Ts−Δt.

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