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15 January, 13:30

A train whistle is 580 Hz when stationary. It is coming toward you at 18.8 m/s. What frequency do you hear?

(Speed of sound = 343 m/s) (Unit=Hz)

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Answers (2)
  1. 15 January, 15:16
    0
    612 Hz.

    Step-by-step explanation:

    The frequency of the sound will be proportionally higher when coming towards you. The increase is related to the speed of the train.

    So the frequency will be:

    580 + (580 / 343) * 18.8

    = 612 Hz.

    This is called the Doppler effect.
  2. 15 January, 17:26
    0
    612 hz

    Step-by-step explanation:

    580 + (580 / 343) * 18.8

    = 612 Hz.
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