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ZZ help dopplers effect PHysics?

  1. Nov 16, 2009 #1
    PLZZZ help dopplers effect PHysics?
    Two students Jan & Lee Hold Buzzers which operate at different frequencies producing a beat frequenzy of 4 Hertz, When Jan runs away from Lee, Lee hears that beat frequency increaes. Who has higher frequency and why???????????????
  2. jcsd
  3. Nov 16, 2009 #2


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    Beat frequency is the difference in frequencies.
    If Lee's frequency is f, Jan's frequency will be (f + 4) Hz or (f - 4) Hz. Jan runs away from Lee. Lee will hear the buzzer of Jan with reduced frequency. So the beat frequency will increases only if Jan's frequency is ------?
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