Doppler Effect.

Slides:

Advertisements

Similar presentations

Chapter 12 Sound. What is sound? Sound is a compressional wave which travels through the air through a series of compressions and rarefactions.

Advertisements

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.

Vibrations and Waves Chapter 25. Vibration of a Pendulum  Vibration – a wiggle in time  A vibration cannot exist in one instant, but needs time to move.

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

Doppler Effect.

Doppler Effect. Moving Source  Light moves equally in all directions from a source. Circular (or spherical) patternCircular (or spherical) pattern 

Doppler Effect Students will learn about the Doppler Effect.

The Doppler Effect. Doppler Effect & Sound Christian Doppler Observing the Doppler Effect Christian Doppler Observing the Doppler Effect Christian Doppler.

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

Doppler Effect. What sound do you hear when a car races by at the race track? Or when an ambulance/police car speeds by?

Do Now: Write down some uses or practical applications of the Doppler Effect Please have your H/W out ready for me to collect with your name on it Rātapu,

Doppler Shift + observer moving towards, - observer moving away, -source moving towards, + source moving away. v = speed of sound v o = observer speed.

Section  The Doppler Effect: A change in frequency (pitch) due to relative motion between a source of sound and its observer.

Sound A Mechanical wave. The Nature of a Sound Wave Sound originates when a body moves back and forth rapidly enough to send a coursing wave through the.

Doppler Effect Physics 11.

Tuesday May 26 Doppler effect Warm up: What’s the best thing you did over the long weekend? NOTES Ans: 0.91 sec.

SOUND WAVES, HEARING AND INTERACTIONS

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.

Doppler Effect, Bow Waves, and Shock Waves Doppler Effect  ~apparent change in frequency of a wave due to the motion of the source of the wave.  If.

Doppler effect and Shock waves Lecture 10 Pre-reading : §16.8–16.9 Please take a clicker and an evaluation form.

CHAPTER 14 Sound Doppler Effect A train passes by you with its whistle/horn blowing. You hear one pitch (tone) as the train is coming towards you and a.

Sect. 12-6: Sound Wave Interference & Beats Like any other waves, sound waves can interfere with each other. Example Can lead to beats.

Physics 11 n Waves 6 – Doppler Effect. Constructive & Destructive Interference:

The Doppler Effect.

Chapter 25 Vibrations and Waves. Vibration – a wiggle in time For example: moving back and forth in the same space, ie., pendulum. **A vibration exists.

Waves and Energy Transfer 14.1 Wave Properties Wave A repeating disturbance or movement that transfers energy through matter or space.

"I love hearing that lonesome wail of the train whistle as the

Sound. Characteristics of Sound Intensity of Sound: Decibels The Ear and Its Response; Loudness Interference of Sound Waves; Beats Doppler Effect Topics.

Ch Waves & Sound I. Characteristics of Waves Waves

Doppler Effect. As a wave source approaches, an observer encounters waves with a higher frequency. As the wave source moves away, an observer encounters.

Doppler Effect David William D. Ecoben III-Archimedes.

Introducing Sound Waves David William D. Ecoben III-Archimedes.

The Doppler Effect Pg 503. Bell Ringer  What do you observe when an ambulance with a flashing siren comes towards you? Away from you? Why?

The Doppler Effect Introductory Video as a sound source moves towards you it appears to have a higher frequency than normal as the source moves away it.

Interference & Sound Aim: How do waves behave when they interact with each other?

Doppler Effect A Doppler effect is experienced whenever there is relative motion between a source of waves and an observer. A Doppler effect is experienced.

Doppler effect Eeeeeee – yowwwwwwwwww A change in frequency or pitch of a sound detected by an observer.

Doppler Effect Shift in frequency (high to low) due to the compression of light (or sound) waves in front of a moving object and the expansion of the light.

IP Moving wave sources Moving wave sources.

PHYSICS and math OF SOUND

Section 15.7 The Doppler Effect and Shock Waves (cont.)

Doppler Effect & Shock Waves

Doppler Effect Doppler Effect – The apparent change in frequency of a wave due to the motion of the source and/or the observer Stationary Source – Moving.

CHAPTER 25 Vibration & Waves.

III.) Doppler Effect: an observed change in the frequency of a wave when the source or observer is moving A) Pitch of a sound (how high or low it is) is.

Doppler Effect and Interference

1. WHAT IS SOUND?.

Waves and Sound Table of Contents What Are Waves? Properties of Waves

A wave created by shaking a rope up and down is called a

1. Doppler Effect Change in frequency of a wave due to relative motion between source and observer. A sound wave frequency change is noticed as a change.

"I love hearing that lonesome wail of the train whistle as the

Doppler effect Eeeeeee – yowwwwwwwwww

Chapter 13 Sound Section 1 Sound Waves.

Doppler Effect (Ch. 12 Sec 12 7 p.338 – 342)

Doppler Effect Waves and Sound

11: Wave Phenomena 11.2 The Doppler Effect.

1. Review: what are the parameters of a wave?

Chapter 13 Waves and Sound.

Doppler Effect.

6.2 Wave Phenomena.

Waves and Sound.

Physics 1 Unit 3: Waves Part 3:

Doppler Effect.

Chapter 13 Waves and Sound.

The Doppler Effect.

Doppler Effect Christian Doppler.

Properties of Waves Part 2.

Doppler Effect.

Presentation transcript:

Doppler Effect

Moving Source Sound moves equally in all directions from a source. Circular (or spherical) pattern If the source is moving the origin of successive circles moves.

Wavelength Shift The normal period is T and the observer moves at speed u. The wavelength ahead of the source is shorter. l’ = l - uT The wavelength behind the source is longer. l’ = l + uT

Frequency Shift The period is related to the wavelength. This can be converted into a frequency shift. Insert + for – to get the shift behind the source.

Ambulance An ambulance is approaching at 130 km/h with a siren at 1.2 kHz. What pitch do you hear? Change speed to m/s (130 km/h)/3.6 = 36 m/s Find the Doppler shift. u/v = (36 m/s)/(343 m/s) u/v = 0.105 f’ = f/(1-1.05) = 1340 Hz

Moving Observer If the observer is moving toward the sound the effect is similar, but the wave crests have a different relative spacing. A speed gun uses a double Doppler shift. There is a shift for both the pulse out and reflected signal.

Shock Wave A moving source can exceed the speed of sound. The sound waves constructively interfere on a front at an angle to the motion. This is called a shock wave.

Sonic Boom The speed of sound is called Mach 1. Faster than that speed causes a shock wave – a sonic boom.