Physics II
Solution to Quiz 4

Tuesday 1/19/16	Name
O233: periods 1,2
	CM #

A runner is moving away from a stationary source towards a cliff with a speed v_o. The source frequency is f_s.

cair=344 m/s vo=10.0 m/s fs=500 Hz

(a) What frequency is heard by the runner as she moves away from the source?



fo = fs æ è c+vo c ö ø = (500 Hz) æ è 344 m/s-10.0 m/s 344 m/s ö ø = 485 Hz


(b) There is a reflection of the source signal off the wall. What frequency does the runner hear in regard to the reflected signal?



fo = fs æ è c+vo c ö ø = (500 Hz) æ è 344 m/s+10.0 m/s 344 m/s ö ø = 515 Hz


(c) The runner is carrying a meter which records beat frequencies. What value does the meter record?



fb = Df = (514.53 Hz)-(485.47 Hz) = 29.1 Hz

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On 19 Jan 2016, 10:49.