4) You are riding a bicycle directly away from a siren, whichemits sound at 850

Question

4) You are riding a bicycle directly away from a siren, whichemits sound at 850 Hz. If the sound you hear differs by 3 Hz, what is your speed? Assume the speed ofsound is 340 m/s. a) 678 m/s b) 340 m/s c) 2.4 m/s d) 1.2 m/s e) 0 m/s 4) You are riding a bicycle directly away from a siren, whichemits sound at 850 Hz. If the sound you hear differs by 3 Hz, what is your speed? Assume the speed ofsound is 340 m/s. a) 678 m/s b) 340 m/s c) 2.4 m/s d) 1.2 m/s e) 0 m/s

Explanation / Answer

We know that when source is stationary we have               f' = f (1 - V/v) f' = 847 Hz f = 850 Hz v = 340 m/s V = ?         ==> V = (1 -f'/f)* v                   = (1 - 847 / 850) * 340                   = 1.2 m/s

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