PhysicsLAB: Doppler - A Challenge Problem

PhysicsLAB

Worksheet
Doppler - A Challenge Problem

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A police car is parked on the side of the road using a "speed gun". His assignment is to clock the speed of oncoming cars based on a chart comparing frequency differentials (between his gun's original frequency and the frequency received from the wavefront reflected from the oncoming car) and car speeds.

Refer to the following information for the next seven questions.

A stationary source directs an 800-hz wave toward an approaching object that is traveling at a speed of 25.0 m/s. Our task is to determine the frequency shift between the reflected wave and the original signal.

True or False. There are two Doppler shifts here.

TrueFalse

Prior to striking the approaching object, which Doppler equation would you use: that for a moving source or the one for a moving listener?

moving sourcemoving listener

True or False. If the air temperature is 20°C, the apparent frequency striking the approaching object would be 859 hz.

TrueFalse

The reflected sound wave would appear to be originating from a moving source that has what value as its original wavelength?

How much does the wavelength change as a result of the motion of the approaching object?

0.0291 m0.0538 m0.0729 m1.020 m

What is the frequency shift as heard by the original stationary source when it receives the reflected wave?

What would have been the frequency differential had the car been traveling at 50.0 m/sec towards the stationary police officer?

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 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 with the Doppler Effect 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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