PHYS
12_InstSolManual_PDF_Part16

# 12_InstSolManual_PDF_Part16 - 12-16 Chapter 12 Now consider...

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Now consider the truck as a source, with and the fire engine driver as the listener (Figure 12.60b). The objects are getting closer together so the frequency is increased. (b) The driver detects a frequency of 2120 Hz and the waves returning from the truck move past him at so the wavelength he measures is The wavelength of waves emitted by the fire engine when it is stationary is 12.61. Set Up: To treat the reflection of the waves use Problem-Solving Strategy 3 in Section 12.12. Solve: (a) Since the frequency is increased the moving car must be approaching the police car. Let be the speed of the moving car. The speed of the police car is zero. First consider the moving car as the listener, as shown in Fig-
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Unformatted text preview: ure 12.61a: Figure 12.61 f L 5 1 v 1 v L v 1 v S 2 f S 5 1 v 1 v c v 2 1 1200 Hz 2 ( a ) S L v c f S 5 1200 Hz ( b ) L v p 5 v p 5 ( c ) S v p f S 5 1200 Hz ( d ) v p L S f S 5 1300 Hz 1 1 1 1 f S 5 1 1200 Hz 2 1 v 1 v c 2 v S v c L v c v c v p v c f L 5 1 v 1 v L v 1 v S 2 f S . l 5 344 m / s 2000 Hz 5 0.172 m. l 5 344 m / s 1 30 m / s 2120 Hz 5 0.176 m. 344 m / s 1 30.0 m / s, f L 5 1 v 1 v L v 1 v S 2 f S 5 1 344 m / s 1 30.0 m / s 344 m / s 1 20.0 m / s 2 1 2064 Hz 2 5 2120 Hz f S 5 2064 Hz, 12-16 Chapter 12...
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