Sound.

Slides:

Advertisements

Similar presentations

Physics 12 Source: Giancoli Chapters 11 and 12

Advertisements

Principles of Physics. Sound Result of vibration of air particles around a source Longitudinal wave – air particles get compressed and spread apart as.

SPH3U Exam Review Waves and Sound.

WAVES. Properties of Waves All waves carry energy from one point to another without transferring matter. As an example, when sound travels through air.

WAVES AND VIBRATIONS NOTES

Sound Waves Physics Chapter 13 Section 1. I. Production of sound waves Produced by an object vibrating Produced by an object vibrating -ex. Tuning fork.

Chapter 14 Sound AP Physics B Lecture Notes.

Sound. 1. The ____ of a sound is how high or low we hear its frequency. pitch.

Doppler Effect Moving Source.

SOUND WAVE PROPERTIES Sound longitudinal Sound is a longitudinal (Mechanical)wave caused by a vibrating object Molecules collide, producing sound Examples:

SOUND A vibrating object, such as your voice box, stereo speakers, guitar strings, etc., creates longitudinal waves in the medium around it. When these.

Chapter 15 - Sound Sound wave is a longitudinal wave.

Sound. Sound Waves travel as compressions & expansions Alternating regions of compressed and expanded air These regions move away from source as longitudinal.

Like all waves, sound waves are produced by a vibration.  A tuning fork vibrates to produce a sound.  A guitar string vibrates to produce a sound.

Chapter 13 - Sound 13.1 Sound Waves.

Sound Waves. Review Do you remember anything about _______? Transverse waves Longitudinal waves Mechanical waves Electromagnetic waves.

Unit 10: Sound.

Chapter 13 Pretest 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)

More On Sound. Quality How you can tell one sound source from another even when playing the same frequency Depends on the presence of overtones.

Waves and Sound An Introduction to Waves and Wave Properties.

SOUND WAVES & BEAT FREQUENCY. SOUND WAVES Sound waves are caused by vibrations Vibrations cause contraction and expansion of an object, which creates.

SOUND Can You Hear Me Now?. GOAL 5: Students will describe the characteristics of and investigate Wave Motion, Sound, and Light.  Objective 1: Differentiate.

Chapter 15 Sound What is Sound? a pressure disturbance

Chapter 12 Sound Producing a Sound Wave Characteristics of Sound Waves The Speed of Sound Spherical and Plane Waves The.

Frequency Determines Pitch Sect Min. Warm-up Decide if these statements are true. If not true, correct them. In a longitudinal wave, the vibrations.

Resonance. Resonance of Sound waves Strike one fork with a rubber hammer, then cover the fork. Describe what you hear? tuning fork Sound box.

Ms. Barlow’s 8th Grade Physical Science Class

Chapter 12 Sound. The Origin of Sound  Sound is a longitudinal, mechanical wave.  You can hear sound with a frequency of 20 – 20,000 Hz. Under 20 hz.

The Production of Sound Waves Every sound wave begins with a vibrating object, such as the vibrating prong of a tuning fork. Sound waves are longitudinal.

Sound Waves. Sound is a compressional or longitudinal wave The “wiggle” (compression) is in the same direction as the wave travels.

Sound Lecture 5. Goals  Understand Standing Waves  Gain an understanding of fundamental sound concepts such as intensity and beats  Learn about applications.

Waves & Sound Review Level Physics.

Sound and Music.

Chapter Summary 15.1 Properties and Detection of Sound

The Doppler Effect THE LAST LECTURE.

An Introduction to Waves and Wave Properties

What is the period of oscillation of the pendulum?

Resonance, Doppler effect

Properties of Waves Waves have energy and transfer energy when they interact with matter They cannot travel through empty space!

Waves and Sound Clickers

1. WHAT IS SOUND?.

WAVES AND VIBRATIONS NOTES

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Harmonic Motion and Mechanical Waves

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Notes 21.1 – Properties of Sound

Example Which type of wave requires a material medium to travel through? a) Television b) Light c) Sound d) Radio e) X-ray Sound is a mechanical wave,

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Sound and HOW WE Hear it.

The Doppler Effect.

Mechanical Waves © 2014 Pearson Education, Inc..

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Combining results gives us the case where both observer and source are moving:

Properties of Sound EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Ch Waves & Sound II. The Nature of Sound Speed of Sound

Sound Waves, Pitch, and Loudness

Waves & Sound The Nature of Sound Speed of Sound Human hearing

Properties of Sound EQ: How does intensity, loudness, frequency and pitch affect sound waves?

Sound and Hearing it.

Presentation transcript:

Sound

Wave energy Wave energy depends on amplitude, the more amplitude it has, the more energy it has Amplitude for sound is volume

Sound is a longitudinal wave Sound travels through the air at approximately 340 m/s. (It depends on temperature) It travels through other media as well, often much faster than that! Sound waves are started by vibration of some other material, which starts the air moving. Animation courtesy of Dr. Dan Russell, Kettering University

Hearing Sounds We hear a sound as “high” or “low” depending on its frequency or wavelength. Sounds with short wavelengths and high frequencies sound high-pitched to our ears, and sounds with long wavelengths and low frequencies sound low-pitched. The range of human hearing is from about 20 Hz to about 20,000 Hz.

Doppler Effect The Doppler Effect is the raising or lowering of the perceived pitch of a sound based on the relative motion of observer and source of the sound. When a car blowing its horn races toward you, the sound of its horn appears higher in pitch, since the wavelength has been effectively shortened by the motion of the car relative to you. The opposite happens when the car races away. https://www.youtube.com/watch?v=yq-QP_95U-0

Doppler Effect Stationary source Moving source Animations courtesy of Dr. Dan Russell, Kettering University Supersonic source http://www.lon-capa.org/~mmp/applist/doppler/d.htm

Example The driver of a car blows the horn as the car approaches you. Compared to the horn’s pitch heard by the driver, will the pitch heard by you be lower, higher, or the same? After the car passes you, you notice the horn doesn’t sound as loud, is this observation a result of the Doppler effect?

Resonance Resonance occurs when a vibration from one oscillator occurs at a natural frequency for another oscillator. The first oscillator will cause the second to vibrate.

https://www.youtube.com/watch?v=pRpN9uLiouI

Beats “Beats” is the word physicists use to describe the characteristic loud-soft pattern that characterizes two nearly (but not exactly) matched frequencies. Musicians call this “being out of tune”.

Beats

Beat frequency Beat frequency is the difference between the frequencies of the two waves

Example A student tunes her guitar by striking a 100 Hz A-note on a tuning fork and simultaneously playing the 5th string on her guitar. Listening closely, she hears the amplitude of the combined sound oscillating twice per second. What is the current frequency of the 5th string of her guitar?