A driver travels northbound on a highway at a speed of 28.0 m/s. A police car, t

Question

A driver travels northbound on a highway at a speed of 28.0 m/s. A police car, traveling southbound at a speed of 38.0 m/s approaches with its siren producing sound at a frequency of 2500 Hz.
(a) What frequency does the driver observe as the police car approaches?
Correct: Your answer is correct. Hz
(b) What frequency does the driver detect by after the police car passes him?
2066.93 Correct: Your answer is correct. Hz
(c) Repeat parts (a) and (b) for the case when the police car is traveling northbound.
frequency as the police car approaches
2583Hz
Frequency as the police car passes
_____Hz
I can't get second part of (c) . will rate

Explanation / Answer

a) Relative speed of the vehicles = (28+ 38) = 66m/sec. (343 + 66) = apparent sound speed of 409m/sec. 2500 x (409/343) = 2981Hz. heard. b) (343 - 66) = apparent sound speed of 277m/sec. 2500 x (277/343) = 2066Hz. heard. C. 2184 HZ

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