12_InstSolManual_PDF_Part24

# 12_InstSolManual_PDF_Part24 - 12-24 Chapter 12 12.81 Set Up...

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12.81. Set Up: The greatest frequency shift from the Doppler effect occurs when one speaker is moving away and one is moving toward the person. The speakers have speed where with the positive direction from the listener to the source. Solve: (a) and Speaker A , moving toward the listener: Speaker B , moving toward the listener: (b) A person can her individual beats only up to about 7 Hz and this beat frequency is much larger than that. Reflect: As the turntable rotates faster the beat frequency at this position of the speakers increases. 12.82. Set Up: Let be the speed of the car. Assume the car is traveling to the right. The direction from the listener to the source is positive. When the source is approaching, the frequency is increased and when the source is moving away, the frequency is decreased. Solve: (a) (b) car approaching: The situation is sketched in Figure 12.82a. Figure 12.82
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Unformatted text preview: car moving away: The situation is sketched in Figure 12.82b. and v car 5 0.059 v 2.059 5 0.0287 v 5 1 0.0287 21 344 m / s 2 5 9.9 m / s 1.059 v 2 1.059 v car 5 v 1 v car f L1 f L2 5 1.059 5 1 v v 2 v car 2 f S / 1 v v 1 v car 2 f S 5 1 v v 2 v car 21 v 1 v car v 2 5 v 1 v car v 2 v car f L2 5 1 v v 1 v car 2 f S v S 5 1 v car . ( b ) L v L 5 f L1 L v L 5 f L2 ( a ) 1 1 S v car f S S v car f S f L1 5 1 v v 2 v car 2 f S . v S 5 2 v car . 2 1 / 12 5 1.059 v car v L 5 0. f beat 5 f 1 2 f 2 5 1119 Hz 2 1081 Hz 5 38 Hz f LB 5 1 v v 1 5.89 m / s 2 1 1100 Hz 2 5 1081 Hz f LA 5 1 v v 2 5.89 m / s 2 1 1100 Hz 2 5 1119 Hz. v 5 1 0.75 m 21 7.85 rad / s 2 5 5.89 m v 5 1 75 rpm 2 1 2 p rad 1 rev 21 1 min 60 s 2 5 7.85 rad / s f 5 v l 5 344 m / s 0.313 m 5 1100 Hz. v 5 344 m / s f L 5 1 v 1 v L v 1 v S 2 f S , r 5 0.75 m. v 5 r v , 12-24 Chapter 12...
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