P18_075 - v + v S = v S = 1 r r v . If v = 343 m/s, we get...

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75. (a) With the detector stationary, we seek a value of source speed v S such that the frequency ratio (heard/emitted) is r =(20kHz) / (30 kHz) = 2 / 3. From the Doppler e±ect formula, we ²nd f 0 = f µ v +0
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Unformatted text preview: v + v S = v S = 1 r r v . If v = 343 m/s, we get v S = 171 . 5 m/s which converts to 617 km/h. (b) If r = 20 / 22, we nd v S = 34 . 3 m / s = 123 km/h....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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