Doppler_Effect_WS__Key

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Name;: Doppler Effect Worksheet Conceptual: 1. When a sound source moves towards an observer, the sound source a. Has an increased pitch b. Has a decreased pitch c. The same pitch. d. Not enough information 2. When a sound source moves away from an observer, its sound source a. Has an increased pitch b. Has a decreased pitch c. The same pitch. d. Not enough information 3. When a sound source is stationary from an observer, it's sound source a. Has an increased pitch b. Has a decreased pitch c. The same pitch. d. Not enough information 4. The changed pitch of the Doppler effect is due to changes in a. Wave Frequency b. Wave Speed c. Wave Medium 5. The Doppler effect can be applied to the following, a. Sound b. Light c. Seismic Waves d. All of the Above 6. Higher frequency results when a. A sound source is stationary to an observer b. When the sound source is moving away from an observer c. When the sound source is stationary and the observer is moving away. d. When the sound source is moving towards a stationary observer. 7. Lower frequency results when a. A sound source is stationary to an observer b. When the sound source is moving away from an observer c. When the sound source is stationary and the observer is towards the source. d. When the sound source is moving towards a stationary observer.

8. Two cars are on the same straight road. Car A is moving east at 60 mph and sounds its horn at 655 Hz. Rank from highest to lowest the frequency observed by another car’s driver, Car B, for the following cases. a. Car B is moving east at 65 mph and is behind car A. b. Car B is moving east at 65 mph and is in front of car A. c. Car B is moving west at 65 mph and is behind car A. d. Car B is moving west at 65 mph and is in front of car A. ( Vwave X Vobserver ) s fsourcc Jobserved = e Vware £ Vsoure Quantitative: 9. What is the frequency heard by a soccer mom driving at 5 m/s toward a soccer game where the whistle, 800 Hz. Assume the speed of sound in air is 343 m/s? 10. A ball hits a car, breaking its window and triggering the car’s alarm system which sounds at a frequency of 1000 Hz. What frequency is heard by a boy on a scooter riding away from the car at 5 m/s? 11. A jogger has a vest that emits a sound of 400 Hz. The jogger is approaching a stationary observer and the observer detects a frequency of 405. Hz, how fast is the jogger moving? The speed of sound is 343 m/s. 12. A commuter train passes a passenger platform at a constant speed of 37 m/s. The train horn is sounded at a frequency of 340 Hz, what frequency does the stationary observer on the platform hear?

13. A burglar sets off an alarm that emits a frequency of 1300. hertz. What frequency does a person hear who is driving towards the alarm at a speed of 40.0 m/s? 14. Two trains on separate tracks are moving towards each other. Train 1 has a speed of 35 m/s; train 2, a speed of 20 m/s. Train 2 blows its horn, emitting a frequency of 550 Hz. What is the frequency heard by the engineer on train 1? 15. A car's horn emits a sound of 460 Hz at rest. The horn is sounded while the car is moving down the street. A cyclist moving in the same direction with one-eighth the car's speed hears a frequency of 405 Hz. a. Is the cyclist ahead of or behind the car? b. What is the speed of the car? 16. Bats can fly around at 5 m/s chasing insects flying in the same direction. The bat emits a 39.8-kHz chirp and receives back an echo at 40.5 kHz. What is the speed of the insect? 17. A tuning fork vibrating at 580 Hz falls from rest and accelerates with gravity. How far below the point of release is the tuning fork when waves of the frequency of 540 Hz reach the release point?

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18. A formula one car passes a grandstand going 120 m/s. The people in the grandstand hear a frequency of 1.5 kHz. What is the frequency of the sound being emitted by the engine? 19.AP Problem-A jet is traveling at Mach 2, (2 times the speed of sound), at an altitude of 22 km is directly over a person at time t = 0 as shown in the figure. Assume the average speed of sound in air is 335 m/s over the path of the sound. a. At what time will the person encounter the shock wave due to the sound emitted att=07? Observer hears the “boom” b. Where will the plane be when this shock wave is heard? 20. A ball has a speaker embedded inside it that emits a constant frequency of 2 kHz. If this ball was thrown straight up at 15 m/s, what would the frequency the thrower hear when the ball is at; a. t=0.5s b. t=1.5s c. t=20s G ENMERNC & 0

N kRN 20. Key W OoOOrXr0Ow> C,B,A,D 812 Hz . 985.4 Hz . 4.2 m/s . 307 Hz . 1,452 Hz . 644 Hz a. Behind b. 54.3 m/s . 1 m/s . 33m . 2,025 Hz a. 57/s b. 38.1 km a. 1,943 Hz . 2,000 Hz 2,030 Hz O O

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