12_InstSolManual_PDF_Part17

12_InstSolManual_PDF_Part17 - sound f L 5 1 v 2 v v 1 v S 2...

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Then consider the moving car as the source and the police car as the listener (Figure 12.61b): gives Solving for gives (b) Repeat the calculation of part (a), but now toward the other car. Waves received by the car (Figure 12.61c): Waves reflected by the car and received by the police car (Figure 12.61d): Reflect: The cars move toward each other with a greater relative speed in (b) and the increase in frequency is much larger there. 12.62. Set Up: Take the positive direction to be from listener to source and apply Solve: (a) See Figure 12.62a. Figure 12.62 The frequency observed by the listener approaches infinity as the speed of the approaching source approaches the speed of sound. (b) See Figure 12.62b. (c) See Figure 12.62c. The frequency observed by the listener approaches zero as the speed of the receding listener approaches the speed of
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Unformatted text preview: sound. f L 5 1 v 2 v v 1 v S 2 f S 5 0. f L 5 1 v 1 v v 2 f S 5 2 f S . f L 5 1 v v 2 v 2 f S S ` . ( a ) v 5 L f S ( b ) v 5 S ( c ) v 5 S 1 1 1 S v L v L v f L 5 1 v 1 v L v 1 v S 2 f S . f L 5 1 v 1 v p v 2 v c 2 f S 5 1 344 m / s 1 20 m / s 344 m / s 2 7 m / s 2 1 1300 Hz 2 5 1404 Hz f L 5 1 v 1 v c v 2 v p 2 f S 5 1 344 m / s 1 7 m / s 344 m / s 2 20 m / s 2 1 1200 Hz 2 5 1300 Hz v p 5 20.0 m / s, v c 5 1 50 2450 2 v 5 1 50 2450 2 1 344 m / s 2 5 7.02 m / s v c 1250 Hz 5 1 v v 2 v c 21 v 1 v c v 2 1 1200 Hz 2 . f L 5 1 v 1 v L v 1 v S 2 f S Mechanical Waves and Sound 12-17...
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