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  A police sonar detector operates by emitting a sound at 42 ... ...

  A police sonar detector operates by emitting a sound at 42 kHz. This sound bounces off an approaching vehicle going 50 m/s. What is the frequency of the signal received back at the detector? (vs = 350 m/s)
(A) 36 kHz
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 12. Sound

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