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28 March, 00:03

A truck is traveling 70.0 kph away from you. The driver is blowing the horn, which has a frequency of 400 Hz. The air temperature is 25ÁC. What is the observed frequency of the horn?

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  1. R
    28 March, 03:59
    0
    There are several information's already given in the question. Based on those information's the answer can be easily deduced.

    Speed of the truck = 70 kph

    = 19.44 m/s

    Speed of sound = 343 m/s

    Then

    Observed frequency = 400 Hz ∗ 343 m/s / 19.44m/s + 343 m / s

    = 378.54

    = 379 Hz
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