bill and Elaine are holding portable beepers that sound at slightly different fr

Question

bill and Elaine are holding portable beepers that sound at slightly different frequencies. when they are both standing still, the two beepers produce a beat frequency of 4 hertz. when Elaine begins to run away from Bill, the beat frequency increases. whose beeper was at the higher initial frequency? explain bill and Elaine are holding portable beepers that sound at slightly different frequencies. when they are both standing still, the two beepers produce a beat frequency of 4 hertz. when Elaine begins to run away from Bill, the beat frequency increases. whose beeper was at the higher initial frequency? explain bill and Elaine are holding portable beepers that sound at slightly different frequencies. when they are both standing still, the two beepers produce a beat frequency of 4 hertz. when Elaine begins to run away from Bill, the beat frequency increases. whose beeper was at the higher initial frequency? explain

Explanation / Answer

f = fB - fE = 4   or f = fE - fB = 4

when Ealine runs away

fE' be the frequency

fE' < fE

f' = fB - fE'    or f' = fE' - fB

f' > f

therefore

fB - fE = 4

fB > fE

Bill beeper is at higher frequency

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