16.5 The Nature of Sound Longitudinal Sound Waves Sound in air is a longitudinal wave that is created by a vibrating object, such as a guitar string, the.

Slides:

Advertisements

Similar presentations

Waves Waves are of three main types: 1. Mechanical waves. We encounter these almost constantly; common examples include water waves, sound waves, and.

Advertisements

a range of compression wave frequencies to which the

The Nature of Sound Students will describe how sound is caused by vibrations, how it is transmitted through a medium. Students will also compare the speed.

Chapter-16 (continued) The Nature of Sound Longitudinal Sound Waves Sound in air is a longitudinal wave that is created by a vibrating object, such.

Chapter 12 SOUND.

Faculty of Computers and Information Fayoum University 

Sound. Sound Waves  Sound waves are longitudinal waves.  The source of a sound wave is a vibrating object.  Only certain wavelengths of longitudinal.

Introduction to Sound Unit 13, Presentation 1. Producing a Sound Wave  Sound waves are longitudinal waves traveling through a medium  A tuning fork.

All sounds are produced by the vibration of matter. If there is no vibration, there is no sound.

Cutnell/Johnson Physics 8th edition Reading Quiz Questions

Phy 202: General Physics II Ch 16: Waves & Sound Lecture Notes.

Sound. Sound waves are longitudinal pressure waves.

Compressional Waves.  Requires a medium for propagation.  Compression of molecules transmit sound.

Recording Arts…Audio Fall Range of Human Hearing 20 Hz – 20,000 Hz or 20 Hz – 20 kHz.

Chapter 26 SOUND All Sounds are produced by the vibrations of material objects.

SOUND Tiffany Rhodes Physics. Topics Covered Source Wave Medium Frequency Amplitude Speed Mach Number.

What is sound? Sound is a longitudinal wave produced by a vibrating source Examples of sources: tuning fork, vocal cords, lips or reed on a musical instrument.

Ch 16. Waves and Sound Transverse Wave Longitudinal Wave

C HAPTER 16 S OUND Nuay, Emmanuel Barquila, Rae Angelo Delos Reyes, Remjun.

Anything that vibrates generates a sound! (unless it’s in a vacuum)

Prepared by Bancairen, Karen Mae L. Entong, Jenilyn O. Ramacho, Aileen Q. Violeta, Lean B.

SOUND CHAPTER 12. All Sound Has 3 Aspects… 1.Source 2.Energy 3.Detected Sound is Longitudinal Waves (Compression Waves) Sound must have a medium. Sound.

Standing Waves and the Overtone Series

ELASTIC WAVES AND SOUND I.I.S. “BERETTA” – LICEO SCIENTIFICO “MORETTI” CLIL PHYSICS: To Italy Through From.

Sound Waves More Than Meets the Eye!!. What type of wave is this??? Transverse.

Chapter 21 – The Nature of Sound

Sound. Speed of sound in solids, liquids, and gases Speed of sound in gas (air): 344 m/sec. Speed of sound in liquid (water): 1100 m/sec Speed of sound.

Waves Waves are of three main types: 1. Mechanical waves. We encounter these almost constantly; common examples include water waves, sound waves, and seismic.

Sound. Sound Moves in 3 Dimensions Sound Basics Sound – A wave of energy created by vibrating objects that travels through a medium Origin – vibrating.

SOUND Longitudinal Wave Travels through some medium Cannot travel through a vacuum How does vibrating drum produce sound? Skin moving up presses air.

Transverse Wave The direction of particle oscillation is perpendicular to the direction of wave propagation.

Types of Traveling Waves

Waves and Sound Key Concepts: Pulses Wave Motion Types of WavesStanding Waves & Resonance Sound Doppler Effect.

Sound Sound waves are –Longitudinal –Pressure Waves Infrasonic – less than 20 Hz Audible – between 20 and 20,000 Hz Ultrasonic – greater than 20,000 Hz.

Sound!. How are they made? Sound waves are made by vibrations. (simple harmonic motion) Sound waves are made by vibrations. (simple harmonic motion) These.

Physics 101: Lecture 33 Sound

Sound AP Physics Chapter Characteristics of Sound Vibration and Waves.

The production of sound Waves always begin with A vibrating object.

Sound AP Physics Chapter 12.

ELASTIC WAVES AND SOUND I.I.S. “BERETTA” – LICEO SCIENTIFICO “MORETTI” From Finland CLIL PHYSICS: To Italy.

Chapter 26: Sound. The Origin of Sound  All sounds are produced by the vibrations of material objects  Pitch – our subjective impression of sound 

SPH3U: Waves & Sound Wave Speed & Sound. The Universal Wave Equation Recall that the frequency of a wave is the number of complete cycles that pass a.

C H A P T E R 16 Waves and Sound F/A 18 fighter jet emerges from a cloud caused when it breaks through the sound barrier. (Boeing) (Boeing) Speed of sound.

Sound 3/27/15. Big Waves Video Big Waves: Ct1U&feature=related Ct1U&feature=related.

Sound Chapter Properties of Sound  Sound waves are caused by vibrations and carry energy through a medium.  The speed of sound depends on the.

Chapter 13 Sound Physics. Sound ♪Sound Waves ♪Longitudinal ♪Require a Medium.

AN ACTIVE LEARNING ASSIGNMENT IN “AUDIO AND VIDEO SYSTEMS” GUIDED BY : PROF. VISMAY YAGNIK PROF. NIRAV PATEL PREPARED BY : MOHNISH LAVANIA ( )

Bell Ringer What causes sound?. Bell Ringer Explain one station from yesterday. How did length affect pitch? How did sound travel through different materials?

Properties Of Sound Sound waves are produced as longitudinal waves by compressions and rarefactions in matter. The medium for sound waves can be solid,

Alternately compresses and then rarefies (spreads out) the air molecules Created by vibrating matter ex. Tuning fork Sound is a longitudinal wave; air.

What is sound? Sound is a longitudinal wave which travels through the air through a series of compressions and rarefactions.

Book Chapters 16 and 17 Unit 8 - Waves and Sound.

Physics Book Chapters 16 and 17 Conceptual Book Chapters 25 and 26 Unit 9 - Waves and Sound.

Sound Objectives: Characteristics of Sound Doppler Effect

What is the period of oscillation of the pendulum?

Sound Learning Objectives:

Sound Longitudinal wave requires a medium (cannot travel in a vacuum)

SOUND a range of compression wave frequencies to which the

Chapter 14 Sound.

ELASTIC WAVES AND SOUND

Vibrations through a medium

1. Which of the following is a false statement?

All sounds are produced by the vibration of matter

Sound and Waves.

How sound travels and how we hear it!

Presentation transcript:

16.5 The Nature of Sound Longitudinal Sound Waves Sound in air is a longitudinal wave that is created by a vibrating object, such as a guitar string, the human vocal cords, or the diaphragm of a loudspeaker.

Sound cannot propagate in a vacuum Bell in a vacuum

How do we hear?

Wave Picture

Graphic representations of a sound wave. Air at equilibrium, in the absence of a sound wave; Compressions and rarefactions that constitute a sound wave; Transverse representation of the wave, showing amplitude (A) and wavelength (λ). Name the x axis? What are the choices for the y-axis? Draw a transverse representation of a wave, name the axes, and show period.

The Frequency of a Sound Wave Audible Range: 20 Hz ,000 Hz. Infrasonic waves: Sound waves with frequencies < 20 Hz. Rhinoceroses use infrasonic frequencies as low as 5 Hz to call one another Ultrasonic waves: Sound waves with frequencies > 20,000 Hz. Bats use ultrasonic frequencies up to 100 kHz for locating their food sources and navigating.

Objective and Subjective properties of sound Objective properties can be measured, used in physics. Subjective properties are subjective to the person, used in music. Objective propertySubjective quality FrequencyPitch IntensityLoudness WaveformTymbre or Quality

Speed of Sound in an ideal gas Gases Speed of Sound (m/s) Air (0 °C) 331 Air (20 °C) 343 Carbon dioxide (0 °C) 259 Oxygen (0 °C) 316 Helium (0 °C) 965 Liquids Speed of Sound (m/s) Chloroform (20 °C) 1004 Ethyl alcohol (20 °C) 1162 Mercury (20 °C) 1450 Fresh water (20 °C) 1482 Seawater (20 °C) 1522 Solids Speed of Sound (m/s) Copper 5010 Glass (Pyrex) 5640 Lead 1960 Steel 5960 γ = 1.40 (ratio of specific heats for air) m = 4.8 x kg (average molecular mass of air) k = 1.38 x J/K (Boltzmann constant) T= temperature in Kelvin

16.7 Sound Intensity The sound intensity I is defined as the sound power P that passes perpendicularly through a surface divided by the area A of that surface: The unit of sound intensity is power per unit area, or W/m 2.

Human Ear and SensitivitySensitivity Audible frequency range: 20 Hz – 20,000 Hz Audible intensity range: 10 –12 W/m w/m 2 10 –12 W/m 2 = Threshold of hearing 10 W/m 2 = Threshold of pain

16.8 Decibels The decibel (dB) is a measurement unit used when comparing two sound intensities. The intensity level  (expressed in decibels) relative to the threshold of hearing, I o is defined as follows:

Intensity I (W/m 2 ) Intensity Level  (dB) Threshold of hearing1.0 × Rustling leaves1.0 × Whisper1.0 × Normal conversation (1 meter)3.2 × Inside car in city traffic1.0 × Car without muffler1.0 × Live rock concert Threshold of pain10130 TABLE 16.2 Typical Sound Intensities and Intensity Levels Relative to the Threshold of Hearing