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Apparent frequncy of sound heard?

  1. Aug 10, 2014 #1
    1. The problem statement, all variables and given/known data

    A car is moving in a straight line at 30m/s approaches a stationary source which emits sound of frequency 5000hz. If the speed of sound is 330m/s . The apparent frequncy received by car is ((330+30)/ 330) x 5000= 5455hz.
    What 's the frequency reflected form the car? the ans given is 6001hz.

    why not the frequency received by the car = frequency of sound reflected by the car? which means the apparent frequency reflected form the car is also = 5455hz?

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Aug 10, 2014 #2

    olivermsun

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    Science Advisor

    The reflected sound is at the frequency you say, but only when "heard" from the car. The car itself is a source moving with respect to the medium, in the direction of the emitted (reflected) sound.
     
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