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Pleaseeeeeeeeeeeeeeeee help me.... test monday?
You are standing still. What frequency do you detect if a fire engine whose siren emits at 1550 Hz moves at a speed of 32 m/s.
a.) toward you or
b.) away from you?
3 Answers
- Anonymous1 decade agoFavorite Answer
Work it out yourself! and by the way it is A
- 1 decade ago
You use the formula describing the doppler effect:
perceived frequency = (V + Vr)/(V + Vs) * original frequency.
V = sound velocity (343 m/s)
Vr = velocity of the sound source (32 m/s)
Vs = velocity of the sound receiver (0 m/s)
(Vr = -32 m/s when it is moving away)
Source(s): http://en.wikipedia.org/wiki/Doppler_effect
