PhysicsLAB: Practice with the Doppler Effect

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Worksheet
Practice with the Doppler Effect

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This physlet developed at Davidson College shows how a moving source affects the apparent frequency heard by a stationary listener. The resource lesson on the Doppler Effect can be accessed through this link.

Use the hint buttons to assist you in answering these questions. Feel free to view correct answers as often as you need always remembering to try and make your first answers as accurate as possible. You must show all of your work on your papers and get then initialed and dated for your notebooks.

1. What is the frequency heard by a person driving at 15 m/sec toward a blowing factory whistle (f = 800 hz) if the speed of sound is 340.6 m/sec?

764.8 hz793.6 hz806.4 hz835.2 hz

2. What frequency would he hear after passing the factory if he continues at the same speed?

Refer to the following information for the next eight questions.

While standing near a railroad crossing, a person hears a distant train horn. According to the train's engineer, the frequency emitted by the horn is 440 hz. The train is traveling at 20.0 m/sec and the speed of sound is 346 m/sec.

3. True or False. To work this problem you would use the Doppler equations for a moving source.

TrueFalse

4. What would be the wavelength of the train's horn if the train were at rest?

5. By how much is the horn's wavelength changed as a result of the train's motion?

0.0357 m0.0393 m0.0454 m0.0578 m

6. What is the adjusted wavelength that reaches the bystander as the train approaches the crossing?

7. What is the adjusted wavelength that reaches the bystander once the train has passed the crossing?

8. Which of the following combinations correctly describes the frequencies heard by the bystander at the train crossing?

467.2 hz while approaching, 440 hz through the crossing, 412.8 hz while receding
467.2 hz while approaching, 440 hz through the crossing, 416.2 hz while receding
416.2 hz while approaching, 440 hz through the crossing, 463.8 hz while receding
412.8 hz while approaching, 440 hz through the crossing, 467.2 hz while receding

9. True or False. If the 440 hz horn was instead a stationary crossing alarm and the "bystander" had been a passenger on a train moving at 20.0 m/sec, the apparent frequencies calculated in question #8 would still be the same.

TrueFalse

10. What change in frequency would the "bystander," now a passenger on a moving train, hear?

Related Documents

Lab:	Labs - Directions: Constructive and Destructive Interference Labs - Doppler Effect: Source Moving Labs - Frequency of Vibrating Strings Labs - Illuminance by a Light Source Labs - Inertial Mass Labs - Interference Shading Labs - Pipe Music Labs - Relationship Between Tension in a String and Wave Speed Labs - Relationship Between Tension in a String and Wave Speed Along the String Labs - Ripple Tank Checklists Labs - Ripple Tank Checklists Labs - Ripple Tank Sample Solutions Labs - Ripple Tank Student Involvement Sheet Labs - Simple Pendulums: Class Data Labs - Simple Pendulums: LabPro Data Labs - Speed of a Wave Along a Spring Labs - Speed of Sound in Air Labs - Speed of Sound in Copper Labs - Video: Law of Reflection Labs - Video: Law of Reflection Sample Diagram
Resource Lesson:	RL - Barrier Waves, Bow Waves, and Shock Waves RL - Beats: An Example of Interference RL - Interference of Waves RL - Interference: In-phase Sound Sources RL - Introduction to Sound RL - Law of Reflection RL - Physical Optics - Thin Film Interference RL - Resonance in Pipes RL - Resonance in Strings RL - Ripple Tank Video Guides RL - SHM Equations RL - Simple Harmonic Motion RL - Sound Level Intensity RL - Speed of Waves Along a String RL - The Doppler Effect RL - Vibrating Systems - Simple Pendulums RL - Vibration Graphs RL - Wave Fundamentals RL - Waveform vs Vibration Graphs REV - Orbitals
Review:	REV - Chapter 26: Sound REV - Honors Review: Waves and Introductory Skills REV - Physics I Review: Waves and Introductory Skills REV - Sound REV - Waves and Sound REV - Waves and Sound
Worksheet:	APP - Echo Chamber APP - The Dog-Eared Page CP - Light Properties CP - Reflection CP - Shock Waves CP - Sound CP - Waves and Vibrations NT - Apparent Depth NT - Atmospheric Refraction NT - Concert NT - Light vs Sound Waves NT - Shock Cone NT - Sound Waves NT - Standing Waves WS - Beats WS - Beats, Doppler, Resonance Pipes, and Sound Intensity WS - Counting Vibrations and Calculating Frequency/Period WS - Doppler - A Challenge Problem WS - Doppler Effect WS - Fixed and Free-end Reflections WS - Fundamental Wave Terms WS - Illuminance 1 WS - Illuminance 2 WS - Interference: In-phase Sound Sources WS - Lab Discussion: Inertial and Gravitational Mass WS - More Practice with Resonance in Pipes WS - More Practice with the Doppler Practice WS - Practice with Resonance in Pipes WS - Practice: Speed of a Wave Along a String WS - Pulse Superposition: Interference WS - Ripple Tank Review WS - Sound Vocabulary WS - Speed of Sound WS - Speed of Sound (Honors) WS - Standing Wave Patterns #1 WS - Standing Wave Patterns #2 WS - Standing Wave Patterns #3 WS - Standing Wave Patterns #4 WS - Vibrating Systems - Period and Frequency WS - Wave Phenomena Reading Guide WS - Wave Pulses WS - Waveform and Vibration Graphs #1 WS - Waveform and Vibration Graphs #2 TB - 25A: Introduction to Waves and Vibrations TB - 25B: Vibrations and Waves TB - 25C: Wave Speed TB - 25D: Interference TB - 25E: Doppler TB - 25F: Doppler Effect (continued) TB - 26B: Speed of Sound TB - 26C: Resonance TB - 26D: Beats TB - 26E: Decibels TB - 27A: Light Properties TB - Decibels and Sound Intensity #1 TB - Decibels and Sound Intensity #2 TB - Interference Re-examined TB - Refraction Phenomena Reading Questions TB - Sound: Mixed Practice TB - Waves and Vibrations

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