 Sound waves carry information to your ears.  Most people hear sounds between 20 hertz and 20,000 hertz.  Sound waves are longitudinal waves— compressions.

Slides:



Advertisements
Similar presentations
Mechanical Waves and Sound
Advertisements

Chapter 17 Mechanical Waves and Sound
How Sound Travels Sound is a mechanical wave It moves by vibrating particles in: –Solids –Liquids –Gases Sound can not travel in a vacuum (empty space)!!!
You can identify sounds without seeing them because sound waves carry information to your ears. People who work in places where sound is very loud need.
By Aimee Chavez. Wave: a disturbance that transfers energy from place to place. The material through which a wave travels through is called a medium.
Sound and Hearing. Sound Waves Sound waves are mechanical and longitudinal waves What does this tell you about sound waves? Sound waves need a material.
Mechanical Waves and Sound
+ Perceiving Sound. + Before we start! A review of Light.
Mechanical Waves and Sound Ch. 17 Physical Science.
18 – 2 The Nature of Sound.
Chapter 17: Mechanical Waves and Sound
17.4 Sound and Hearing Sound waves are longitudinal waves that travel through a medium. Many behaviors of sound can be explained by using a few properties:
Waves and Sound. Mechanical Waves Waves are created by an energy source making a vibration that moves through a medium. Mechanical waves are disturbances.
Chapter 10: Sound Section 1: The Nature of Sound
Go to section Interest Grabber Vibrations A wave is a vibration that carries energy from one place to another. But not all vibrations are waves. Hold a.
Mechanical Waves and Sound
Mechanical Waves and Sound
Sound Overview The Facts of Sound The Ear and Sound Sound Vocabulary Musical Instruments and Sound.
SOUND WAVES, HEARING AND INTERACTIONS
SOUND WAVES PRODUCTION  Vibrating prongs set the air molecules in motion  Top: molecules closer together high air pressure (compression)  Bottom:
Chapter 12 Sound.
Making Sound a longitudinal wave produced when matter vibrates – this in turn, causes the medium in which it is in to vibrate ex: tuning fork (the matter)
 1) Determine the wave speed of a wave that has a period of 3 minutes and a wavelength of 0.05 m.  2) How are electromagnetic and mechanical waves different?
Sound. Sound Waves Sound is a disturbance that travels through a medium as a longitudinal wave.
Section 4 Sound and Hearing Properties of Sound Waves Sound waves are longitudinal waves — compressions and rarefactions that travel through a medium.
Sound and Hearing Properties of Sound Waves, Ultrasound, The Doppler Effect.
Mechanical Waves and Sound
Sound. As an object vibrates it gives off energy to the particles of matter around it. These vibrations travel through air in a series of rarefactions.
Sound Sound Waves. The Production of Sound Waves Sound waves are caused by vibrations –The vibrating object has regions of air with relatively high density.
17.4 Sound and Hearing You can identify sounds without seeing them because sound waves carry information to your ears. People who work in places where.
Sound. Speed Factors State of matter  Fastest in a solid; slowest in a gas. Density  Faster in denser substances (iron versus copper). Elasticity 
Sound Chapter Properties of Sound Sound waves – Longitudinal Waves – Caused by vibrations – Carry energy outward, which hit your ear.
Section 4: The Nature of Sound. Sounds All sounds are caused by something that vibrates. Your vocal cords vibrate in relation to controlled bursts of.
SOUND.
Unit 2 Lesson 1 Sound Waves and Hearing Copyright © Houghton Mifflin Harcourt Publishing Company.
M ECHANICAL W AVES Ch TrueFalseStatementTrueFalse There are 2 types of mechanical waves- transverse and longitudinal Transverse waves have compressions.
Ms. Barlow’s 8th Grade Physical Science Class
 Sound is a disturbance that travels through a MEDIUM as a LONGITUDINAL WAVE.
Sound Chapter Properties of Sound  Sound waves are caused by vibrations and carry energy through a medium.  The speed of sound depends on the.
Sound and Hearing Chapter 17.4 Properties of Sound Waves Sound waves are longitudinal waves. Many behaviors of sound can be explained using a few properties-
Sound and Hearing Chapter 17 Section Four. Science Journal Entry 35 Compare and contrast reflection, refraction and diffraction.
What is sound? Sound is a longitudinal wave which travels through the air through a series of compressions and rarefactions.
Essential Question (pg. 81): What happens if the medium vibrates the same way as the wave motion?  It creates a longitudinal wave.
How are sound waves produced? Why does the speed of sound waves vary in different materials? How do your ears enable you to hear sounds? Sound.
SOUND WAVES, HEARING AND INTERACTIONS
Mechanical Waves and Sound
Pearson Prentice Hall Physical Science: Concepts in Action
Reflection How does reflection change a wave? Reflection occurs when a wave bounces off a surface that it cannot pass through. Reflection does not change.
17.4 Sound and Hearing.
SOUND Science.
Chapter 17: Mechanical Waves & Sound
Unit 6 Chapter 18 & 19 Sound and Light
Behavior of Waves 17.3.
Unit 5 Waves Ch. 21 Sec. 1 & 2 What is Sound?.
Mechanical Waves and Sound
The Physics of Sound.
Sound and Hearing it.
Notes 21.1 – Properties of Sound
Sound Chapter 16.
SOUND.
Sound and HOW WE Hear it.
You can identify sounds without seeing them because sound waves carry information to your ears. People who work in places where sound is very loud need.
Sound.
Sound The Nature of Sound.
Sound Waves Unit 6.
Sound Sound Waves.
SOUND.
Sound.
Sound and Hearing it.
Presentation transcript:

 Sound waves carry information to your ears.  Most people hear sounds between 20 hertz and 20,000 hertz.  Sound waves are longitudinal waves— compressions and rarefactions that travel through a medium.  Many behaviors of sound can be explained using a few properties—speed, intensity and loudness, and frequency and pitch.

 In general, sound waves travel fastest in solids, slower in liquids, and slowest in gases. Particles in a solid tend to be closer together than particles in a liquid or a gas. The speed of sound depends on many factors, including the density of the medium and how elastic the medium is.

 Intensity is the rate at which a wave’s energy flows through a given area. Sound intensity depends on both the wave’s amplitude and the distance from the sound source. The decibel (dB) is a unit that compares the intensity of different sounds.  For every 10-decibel increase, the sound intensity increases tenfold-known as The Decibel Scale of Loudness A 0-decibel sound can just barely be heard. A 20-decibel sound has 100 times more energy per second than a 0-decibel sound. A 30-decibel sound delivers 1000 times more energy per second than a 0-decibel sound.

 Loudness is a physical response to the intensity of sound, modified by physical factors. The loudness depends on sound intensity. Loudness also depends on factors such as the health of your ears and how your brain interprets sound waves.

 The frequency of a sound wave depends on how fast the source of the sound is vibrating.  Pitch is the frequency of a sound as you perceive it. High-frequency sounds have a high pitch, and low-frequency sounds have a low pitch. Pitch also depends on other factors such as your age and the health of your ears.

 Ultrasound is used in a variety of applications, including sonar and ultrasound imaging.  Sonar is a technique for determining the distance to an object under water.  Ultrasound imaging is an important medical technique. Computer software uses reflected pulses of ultrasound to make a detailed map of structures and organs inside the body.

 The Doppler effect is a change in sound frequency caused by motion of the sound source, motion of the listener, or both.  As a source of sound approaches, an observer hears a higher frequency. When the sound source moves away, the observer hears a lower frequency.

 Observer A hears a lower-pitch sound than observer B because the wave fronts are farther apart for observer A.