Question

A source of sound travels toward a stationary person. Is the observed frequency of the sound greater than, less than, or the same as when the source is at rest? Explain. Is the wavelength of the sound greater than, less than, or the same as when the source is at rest? Explain.

Name: Problem 85, Chapter 14: Pearson Physics
Uploaded: 2023-02-22T15:29:31-08:00
Duration: 1 min 14 s
Channel: Melissa Walsh
Description: A source of sound travels toward a stationary person. Is the observed frequency of the sound greater than, less than, or the same as when the source is at rest? Explain. Is the wavelength of the sound greater than, less than, or the same as when the source is at rest? Explain.

   A source of sound travels toward a stationary person. Is the observed frequency of the sound greater than, less than, or the same as when the source is at rest? Explain. Is the wavelength of the sound greater than, less than, or the same as when the source is at rest? Explain.

Pearson Physics

James S. Walker 2013 Edition

Chapter 14, Problem 85

Instant Answer

Solved by Expert Melissa Walsh

02/22/2023

Step 1

When a source of sound is moving towards a stationary person, the observed frequency of the sound will be greater than when the source is at rest. This is because the sound waves are compressed as the source moves towards the person, causing the waves to reach the Show more…

Show all steps

Thanks for your feedback!

A source of sound travels toward a stationary person. Is the observed frequency of the sound greater than, less than, or the same as when the source is at rest? Explain. Is the wavelength of the sound greater than, less than, or the same as when the source is at rest? Explain.

Play audio

Feedback

Melissa Walsh and 81 other educators are ready to help you.

Ask a new question

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

Doppler Effect

The Doppler effect describes how the observed frequency of a wave changes when there is relative motion between the source and the observer. For a source moving toward a stationary observer, the sound waves are compressed, which increases the frequency that the observer hears. This concept is central to understanding changes in both frequency and wavelength when the source is in motion.

Wave Speed, Frequency, and Wavelength Relationship

The relationship between wave speed, frequency, and wavelength (v = f?) is fundamental in wave physics. For sound traveling in air, the speed of sound remains constant, so an increase in the observed frequency, due to the Doppler effect, must be accompanied by a decrease in the wavelength. This relationship explains why the wavelength is shorter when the source moves toward the observer compared to when the source is at rest.

Please give Ace some feedback