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2 April, 21:25

What is the observed frequency of a siren with a frequency of

440 Hz moving towards you at 50 m/s? The speed of sound is

330 m/s.

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Answers (1)
  1. 2 April, 21:32
    0
    Answer: The observed frequency is 518.6 Hz

    Explanation:

    By the Doppler Effect, we know that:

    f' = ((v + v0) / (v - vs)) * f

    where f' is the perceived frequency.

    v is the velocity of the wave, in this case 330m/s

    v0 is the velocity of the receptor, in this case 0m/s

    vs is the velocity of the source, in this case - 50m/s (the minus sign is because it is coming thowards us)

    f is the original frequency, f = 440hz.

    then we have:

    f' = 440hz * (330m/s) / (330m/s - 50m/s) = 518.6 Hz
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