Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 2: Q18E (page 539)

You live on a busy street, but as a music lover, you want to reduce the traffic noise. (a) If you install special sound reflecting windows that reduce the sound intensity level (in dB) by 30 dB, by what fraction have you lowered the sound intensity(W/m2)?(b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?

Short Answer

Expert verified

Therefore, the reduction in sound level is 0.01

Step by step solution

01

Concept of the Reduction in loudness of the sound

Reduction in loudness of the sound is given by the following equation:L=10log(ll0)were,wherel0 is the original sound intensity.

02

Calculate the factor of reduction

Substitute given value for L in dB into equation (1), we obtain the needed factor of reduction as follows:

-20=10logll0/10logll0=-2ll0=10-2ll0=0.01

Therefore, the reduction in sound level is 0.01

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.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

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

A long rope with mass m is suspended from the ceiling and hangs vertically. A wave pulse is produced at the lower end of the rope, and the pulse travels up the rope. Does the speed of the wave pulse change as it moves up the rope, and if so, does it increase or decrease? Explain.

The upper end of a 3.80mlong steel wire is fastened to the ceiling, and a 54.0kg object is suspended from the lower end of the wire. You observe that it takes a transverse pulse 0.0492s to travel from the bottom to the top of the wire. What is the mass of the wire?

By touching a string lightly at its center while bowing, a violinist can produce a note exactly one octave above the note to which the string is tuned—that is, a note with exactly twice the frequency. Why is this possible?

As we discussed in Section 15.1, water waves are a combination of longitudinal and transverse waves. Defend the following statement: “When water waves hit a vertical wall, the wall is a node of the longitudinal displacement but an antinode of the transverse displacement.”

Two identical loudspeakers are located at points A and B, 2.00 m apart. The loudspeakers are driven by the same amplifier and produce sound waves with a frequency of 784 Hz. Take the speed of sound in air to be 344 m/s. A small microphone is moved out from point Balong a line perpendicular to the line connecting Aand B(line BC in Fig. P16.65). (a) At what distances from Bwill there be destructiveinterference? (b) At what distances from Bwill there be constructiveinterference? (c) If the frequency is made low enough, there will be no positions along the line BCat which destructive interference occurs. How low must the frequency be for this to be the case?
See all solutions

Recommended explanations on Physics Textbooks

Nuclear Physics

Read Explanation

Physical Quantities And Units

Read Explanation

Fundamentals of Physics

Read Explanation

Work Energy and Power

Read Explanation

Wave Optics

Read Explanation

Oscillations

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.

Sign-up for free