Sound

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Sound Sound Introduction Longitudinal waves with regions of high and low pressure that travel through a medium Audible, Infrasonic, Ultrasonic Speed of sound varies with temperature and density of the medium • 343 m/s at 23°C in air 03/25/22 03/25/22 APHY101 APHY101 1

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Sound. Introduction Longitudinal waves with regions of high and low pressure that travel through a medium Audible, Infrasonic, Ultrasonic Speed of sound varies with temperature and density of the medium 343 m/s at 23°C in air. Sound. Sound Waves - PowerPoint PPT Presentation

Transcript of Sound

Page 1: Sound

SoundSound Introduction

Longitudinal waves with regions of high and low pressure that travel through a medium

Audible, Infrasonic, Ultrasonic

Speed of sound varies with temperature and density of the medium

• 343 m/s at 23°C in air04/20/2304/20/23 APHY101APHY101 11

Page 2: Sound

SoundSound Sound Waves

Regions of condensation and rarefaction

• Example

The particles experience simple harmonic motion as the wave passes them

• Remember that the particles are already moving when the wave reaches them.

04/20/2304/20/23 APHY101APHY101 22

Page 3: Sound

SoundSound Doppler Effect

Apparent change in the frequency of the wave due to motion of the source or observer

• Sound (trains, sirens) and light

04/20/2304/20/23 APHY101APHY101 33

Page 4: Sound

SoundSound Supersonic Speed and Shock Waves

Shockwave and Mach cone

04/20/2304/20/23 APHY101APHY101 44

Page 5: Sound

Wave Superposition and InterferenceWave Superposition and Interference Superposition

Adding the displacements of two or more waves that are interacting.

• Constructive and destructive

04/20/2304/20/23 APHY101APHY101 55

Page 6: Sound

Wave Superposition and InterferenceWave Superposition and Interference Standing Waves

Adding of two identical waves moving in opposite directions

• Simulation

Nodes and Antinodes

String and wind instruments

04/20/2304/20/23 APHY101APHY101 66

Page 7: Sound

Wave Superposition and InterferenceWave Superposition and Interference Harmonics

04/20/2304/20/23 APHY101APHY101 77

Page 8: Sound

Wave Superposition and InterferenceWave Superposition and Interference Harmonics

04/20/2304/20/23 APHY101APHY101 88

Page 9: Sound

Wave Superposition and InterferenceWave Superposition and Interference Beats

Interference of two sounds with different frequencies

• Tuning instruments in an orchestra

04/20/2304/20/23 APHY101APHY101 99


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Sound On Sound - Inside Track

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écouter Click on one of the ten sounds. sound 1 sound 2 sound 3 sound 4 sound 5 sound 6 soundsspelling sound 7 sound 8 sound 9 sound 10 Exit.

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donner Click on one of the ten sounds. sound 1 sound 2 sound 3 sound 4 sound 5 sound 6 soundsspelling sound 7 sound 8 sound 9 sound 10 Exit.

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Unit 10: Part 2 Sound. outline Sound Waves The Speed of Sound Sound Intensity and Sound Intensity Level Sound Phenomena The Doppler Effect Musical Instruments.

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