/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 15 A person riding on a bus hears t... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 6: Problem 15

A person riding on a bus hears the sound from a horn on a car that is stopped. What is different about the sound when the bus is approaching the car compared to when the bus is moving away from the car?

Short Answer

Expert verified
Answer: The Doppler Effect causes the sound of the car horn to have different pitches when the bus is approaching and moving away from the car. When the bus approaches the car, the pitch of the car horn's sound increases due to the compression of sound waves. In contrast, when the bus moves away from the car, the pitch of the sound decreases as the sound waves become stretched.

Step by step solution

01

Understand Doppler Effect

The Doppler Effect occurs due to the relative motion between the source of the sound (car's horn) and the observer (person on the bus). As the observer moves towards or away from the source, the frequency of the sound wave they hear changes. The change in frequency affects the pitch (or tone) of the sound.
02

Determine the effect when the bus is approaching

When the bus is moving towards the car, the person on the bus is approaching the source of the sound, causing the sound wave to become compressed. This compression results in an increase in frequency and, consequently, an increase in pitch. So, the sound the person hears will be higher in pitch compared to the actual sound of the horn when the bus is stationary.
03

Determine the effect when the bus is moving away

When the bus is moving away from the car, the person on the bus is moving farther from the source of the sound, causing the sound wave to become stretched. This stretching results in a decrease in frequency and, consequently, a decrease in pitch. So, the sound the person hears will be lower in pitch compared to the actual sound of the horn when the bus is stationary.
04

Compare the sounds heard when approaching and moving away

The key difference in the sounds heard by the person on the bus when approaching and moving away from the car lies in the pitch of the sound. As the bus approaches the car, the pitch of the car horn's sound increases, while as the bus moves away from the car, the pitch of the sound decreases. This difference in pitch is due to the Doppler Effect, which is caused by the relative motion between the source of the sound (car's horn) and the observer (person on the bus).

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

\- The highest musical note on the piano has a frequency of \(4,186 \mathrm{~Hz}\). Why would a tape of piano music sound terrible if played on a tape player that reproduces frequencies only up to \(5,000 \mathrm{~Hz}\) ?

What are the three categories used to describe our mental perception of a sound? On what physical properties of sound waves does each depend?

Describe some of the things that would happen if the speed of sound in air suddenly decreased to, say, \(20 \mathrm{~m} / \mathrm{s}\). What would it be like living next to a freeway?

A 100 -Hz pure tone at a \(70-\mathrm{dB}\) sound level and a \(1,000-\mathrm{Hz}\) pure tone at the same sound level are heard separately. Do they sound equally loud? If not, which is louder, and why?

You can buy a measuring device billed as a "sonic tape measure." Describe how a device equipped with an (ultrasonic) speaker, a microphone, and a precision timer could be used to measure the distance from the device to a wall (for example).
See all solutions

Recommended explanations on Physics Textbooks

Thermodynamics

Read Explanation

Energy Physics

Read Explanation

Waves Physics

Read Explanation

Solid State Physics

Read Explanation

Magnetism and Electromagnetic Induction

Read Explanation

Kinematics Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.