Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

(II) $(a)$ Calculate the maximum displacement of air molecules when a $330-\mathrm{Hz}$ sound wave passes whose intensity is at the threshold of pain $(120 \mathrm{dB}) .$ (b) What is the pressureamplitude in this wave?

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

a) $3.2 \times 10^{-5} \mathrm{m}$b) 30$p a$

Physics 101 Mechanics

Chapter 16

Sound

Periodic Motion

Mechanical Waves

Sound and Hearing

Simon Fraser University

University of Sheffield

McMaster University

Lectures

08:15

In physics, sound is a vibration that typically propagates as an audible wave of pressure, through a transmission medium such as a gas, liquid or solid. In human physiology and psychology, sound is the reception of such waves and their perception by the brain. Humans can only hear sound waves as distinct pitches when the frequency lies between about 20 Hz and 20 kHz. Sound above 20 kHz is known as ultrasound and has different physical properties from sound below 20 kHz. Sound waves below 20 Hz are called infrasound. Different species have different hearing ranges. In terms of frequency, the range of ultrasound, infrasound and other upper limits is called the ultrasound.

04:49

In physics, a traveling wave is a wave that propogates without a constant shape, but rather one that changes shape as it moves. In other words, its shape changes as a function of time.

04:04

a. Calculate the maximum d…

01:22

(II) What would be the sou…

03:39

01:52

(a) What is the pressure a…

01:08

A sound wave in air at 20$…

06:18

A sound wave in air at $20…

04:23

Consider a sound wave in t…

02:31

(I) What must be the press…

02:40

What must be the pressure …

06:51

Assuming that the maximum …

03:32

A $40 \mathrm{Hz}$ sound w…

01:12

Consider a sound wave in a…

the relationship between intensity and the amplitude office on wheels is given by eye is equal to To buy square to buy square times will last you for sound density off the medium in the frequency of the sound. Every square times the amplitude off a square in part area asked to find the amplitude. So using a subject A we can find the amplitude as following so it will be cool too. They will be equal to one over by f one would buy it if square root off I over I were two times the density terms I lost you for sound. Now we need I here in order to find I from the given decibels weaken souls equation Isaac All too 10 to the power Better better work in Then times I not I know putting the values off a better. Then we confined I which is won awards per meter square. So the intensity is one ward for me to square. We can plug this value here and pluck the value of frequency. Then we can find it. The amplitude is one or by frequencies 3 30 3 30 So this is times squared off intensity which is one over two times off. The density density is 1.29 1.29 times the speed of sound, which is three for the tree meter per second. So 3 43 after solving this, then we get the amplitude is three point to dies 10 to the power minus five meters. Don't bother minus five meter This is our amplitude for the intensity that corresponds to the given decibels. In part B, we have a hostile firing. The pressure for the given intensity, the pressure to invest in relation Is I Is it cool too? Delta P Square, Delta P Square Pressure square or over two times we lost you for sound dimes, the density Then we could solve for pressure. Then the question of pressure becomes question of pressure. Delta P This doesn't look like be wow, this Delta P, which is equal to the square, root off two times off a density turns were lost E times I induced e We already found the industry which is one the downstairs given reasonable lost your sound employees all those values here Then the pressure we get here is a 30 possible 30 Paschal end off the problem. Thank you for watching

View More Answers From This Book

Find Another Textbook

Numerade Educator

01:51

50.0-Hz AC power line radiates an electromagnetic wave having a maximum elec…

04:32

The magnitude of the net force exerted in the direction on a 2.50-kg particl…

01:33

Wich 47y tlie I mehe~lie nuticle dowuthe figure belou ?B (into t…

04:59

8%f) Problem I0: bloek of mass 2 kgis silling on (iictionless ramp with spri…

05:38

The following diagram shows a number of vectors drawn to scale. The scale is…

04:29

Themasses and coordinatesof four pariicles are as follows 57g *-4Ocm y=AOc; …

03:17

Three point charges are arranged in & triangle as shown in the figure_ P…

02:00

Question 3: (15_marks) From a rifle of mass 4 kg; bullet of mass 50 g is fir…

02:51

In the circuit represented by the diagram below; what is the reading of volt…

04:27

Write these nuclear reactions in equation form: You will also need to use th…