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A car horn is pitched at 520 Hz. The car travels along a straight road at a speed of 25 m/s. towards an observer walking at 2 m/. The speed of sound is 334 m/s. Calculate the frequency heard by the observer when:

(a) the car is moving towards the observer

  • Physics Help ASAP - ,

    http://en.wikipedia.org/wiki/Doppler_effect
    http://hyperphysics.phy-astr.gsu.edu/hbase/sound/dopp.html

  • Physics Help ASAP - ,

    Can you give me the equation instead i'm still confused?

  • Physics Help ASAP - ,

    The equation is listed on both those sources, and you need to memorize it.

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    so which one is it? all of them are on both

  • Physics Help ASAP - ,

    I can’t understand the direction of Observer motion (towards or from the car?).
    If the car and observer move towards each other,
    their relative speed is 25-2 =23 m/s, then
    f=f₀/[1-v/c)] =
    =520/[1-23/334] = 558.5 Hz
    If they move in the same direction v =25+2 = 27 m/s, then
    f=f₀/[1-v/c)] =
    =520/[1-27/334] = 565.7 Hz

    If the car is moving FROM the observer
    f=f₀/[1+ v/c)]
    f= 520/[1+ 23/334)] =486.5 Hz
    f=520/[1+ 27/334)] =481.1 Hz

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