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Sound: speed, Doppler effect
Sound wave density rarefaction densification pressure expansion compression Fluctuations: appr. 0.01%
Speed of sound Compression waves Steel: Strong forces, high density
Speed of sound Compression waves Water Medium forces, small distances
Speed of sound Compression waves Air Nearly no forces, large distances Temperature dependent!
Classification Growing frequency 20 Hertz Hertz=20kHz Audible range 3000 Hz best hearing Infra sound Ultra sound Growing Wave length? Earthquakes, heavy traffic Medical imaging, dog whistles, bats
Wave lengths of the audible range 20 kHz: 20 Hz: Width of a finger Width of a house Objects in our environment are of the same order of size as the wave length of sound waves.
Sound and hollow tubes Sound: transverse wave, compression wave node Loop at open end node Loop at open end Both ends open: One end closed:
Resonances of tubes Fundamental 1 st overtone Closed tubes open tubes
Human ear The human ear canal is a tube of approximately 3 cm length. Determine the fundamental frequency.
Resting sound source source at rest observer at rest Frequency f s Frequency f o V=340m/s
Sound source moving toward observer sourceobserver at rest Frequency f s Frequency f o Observer hears increased pitch (shorter wave length)
Sound source moving away from observer source observer at rest Frequency f s Frequency f o Observer hears decreased pitch (longer wave length)
Frequency heard by observer Source moving toward observer. Perceived wavelength: With Observer:
Observed frequency Observer moving at v o Source moving at v s 40m/s 20m/s rest 300Hz What do the car driver and the person hear?
Long spring A wave travels down a long spring at a speed of 20 m/s. It is generated by a hand moving up and down 10 times per second, with a total displacement.
Doppler Effect. Resting sound source source at rest observer at rest Frequency f s Frequency f o V=340m/s.
Sound Propagation Reflection, refraction, diffraction.
Chapter 14 Sound AP Physics B Lecture Notes Producing a Sound Wave Characteristics of Sound Waves The Speed of Sound Spherical.
Chapter 12 Sound Producing a Sound Wave Characteristics of Sound Waves The Speed of Sound Spherical and Plane Waves The.
Physics Chp 13 SOUND. Compression vs Rarefaction Pitch – how we perceive the frequency Speed depends on medium (air, water, ice) 3D – goes in all directions.
Chapter 15 - Sound Sound wave is a longitudinal wave.
Chapter 15 Sound. Producing a Sound Wave All sound waves begin in a vibrating object. Source vibrates at an audible frequency. Sound waves are longitudinal.
Chapter 16 Sound. The Production of Sound Waves Sound is a result of vibrations or oscillations. Ex: As the prong in the tuning fork swings to the.
Calculate the speed of 25 cm ripples passing through water at 120 waves/s.
Sound Notes. The Nature of Sound Sound travels in longitudinal waves consisting of oscillating compressions and rarefactions through the air. Sound travels.
Sound Ch 13.1 – Sound Waves Sound waves – produced by vibrating objects – longitudinal – mechanical As objects vibrate, a series of compressions.
Chapter 14 Sound. Sound is a pressure wave caused by vibrating sources. The pressure in the medium carrying the sound wave increases and decreases as.
Chapter 15.2 – Characteristics of Waves amplitude – the maximum distance that the particles of a wave’s medium vibrate from their rest position -in a transverse.
Introduction to Sound Unit 13, Presentation 1. Producing a Sound Wave Sound waves are longitudinal waves traveling through a medium A tuning fork.
Chapter 14 Sound. Producing a Sound Wave Sound waves are longitudinal waves traveling through a medium A tuning fork can be used as an example of producing.
What is sound? Sound is a longitudinal wave which travels through the air through a series of compressions and rarefactions.
Chapter 13 Review Sound. 1. What type of waves are sound waves?
13.1 Sound Waves pp Essential Questions How do we perceive sound? What conditions change the way in which we perceive sound?
Waves and Sound Chapter 15 Pages What are waves? Waves are rhythmic disturbances that carry energy through matter or space Waves generally travel.
SOUND WAVES Sound is a longitudinal wave produced by a vibration that travels away from the source through solids, liquids, or gases, but not through a.
THE PHYSICS OF SOUND Playing Music With Palm Pipes (PCV)
Physics 1 What is a wave? A wave is: an energy-transferring disturbance moves through a material medium or a vacuum.
Chapter 15 Sound What is Sound? - a pressure disturbance - Mechanical longitudinal wave - moves away from the source with velocities that are characteristic.
Waves Pre-Assessment Characteristics of Waves. 1 and 2. Draw & label a sine curve. Crests Wavelength amplitudeamplitude Trough DisplacementDisplacement.
Ultrasonic - above 20,000 Hz ex. Ultrasound, bats, dog whistle Infrasonic - below 20 Hz ex. whales, some birds, rhinos Audible sound.
Sound waves are longitudinal waves. When sound waves occur in air, air molecules press together and push apart. Based on what you know about longitudinal.
Sound Waves Sound is a longitudinal wave, meaning that the motion of particles is along the direction of propagation. sound waves are divided into.
The production of sound Waves always begin with A vibrating object.
Sound waves Physics 12 Source: Giancoli Chapters 11 and 12.
Chapter 13 Sound. Section 13.1 Sound Waves The Production of Sound Waves Sound is a result of vibrations or oscillations. Ex: As the prong in the.
SPH3U Exam Review. 1. The speed of sound in water is ____________ the speed of sound in air. A. faster than B. slower than C. the same as D. Sound does.
Sound Basics Overview What is sound Speed Frequency Range.
Waves. A. What are Waves? - Rhythmic disturbances that carry energy through matter and space. B. Medium - Type of material that waves can pass through.
Bell Work: Test Review 1. What is the range of human hearing? 2.How do bats find food? 3.The speed of a wave depends on the ____. 4.Sound waves travel.
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.
Waves A disturbance in a medium that transfers energy and momentum.
Chapter 18 Oscillation, Wave and Sound. Oscillation equation Pendulum Wave equation.
Demos Vernier microphone, logger pro, physics with computers, voice program measure voice, chilandi plates, tuning forks, anyone with perfect pitch, meter.
1 Characteristics of Sound Waves. 2 Transverse and Longitudinal Waves Classification of waves is according to the direction of propagation. In transverse.
Waves and Sound AP Physics 1. What is a wave A WAVE is a vibration or disturbance in space. A MEDIUM is the substance that all SOUND WAVES travel through.
Sound. Sound waves are longitudinal pressure waves.
Parts of waves. 2 Parts Transverse Wave 1) Crest – high point of wave 2) Trough – low point of wave.
Sound. Sound is caused by vibrations which sets air molecules in motion.
Waves & Sound A. Waves 1. The nature of waves a. A wave is a rhythmic disturbance that transfers energy. b. All waves are made by something that vibrates.
Phys 250 Ch15 p1 Chapter 15: Waves and Sound Example: pulse on a string speed of pulse = wave speed = v depends upon tension T and inertia (mass per length.
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.
1 PHYSICS Mr. BALDWIN WAVES 7-Feb-14 AIM: How does sound travel? DO NOW 1.How is sound generated (created)? 2.What is an echo? 3.What type of wave is a.
Chapter 12 Sound. Units of Chapter 12 Characteristics of Sound Intensity of Sound: Decibels The Ear and Its Response; Loudness Sources of Sound: Vibrating.
Copyright © 2009 Pearson Education, Inc. Lecture 1 – Waves & Sound c) Sound.
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