The siren on an ambulance is emitting a sound whose frequency is 2450 Hz . The s

Question

The siren on an ambulance is emitting a sound whose frequency is 2450 Hz. The speed of sound is 343 m/s. (a) If the ambulance is stationary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear? (b)Suppose that the ambulance is moving toward you at a speed of 26.9 m/s. Determine the wavelength and the frequency of the sound you hear. (c) If the ambulance is moving toward you at a speed of 26.9 m/s and you are moving toward it at a speed of 11.0 m/s, find the wavelength and frequency of the sound you hear.

Explanation / Answer

a) Both are stationary therefore no change in frquency

wavelength = 343/2450 = 0.14 m

frequency = 2450 Hz

(b) f = 343/ (343 + 26.9) * 2450 = 2272 Hz

wavelength = 343/2272 = 0.151 m

c)f = 343 - 11 / 343 + 26.9 * 2450 = 2199 Hz

wavelength = 343/2199 = 0.156 m

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