Imagine a bug jiggling its legs and bobbing up and down in the middle of a quiet puddle.

Slides:

Advertisements

Similar presentations

Natural Frequency, Interference, and the Doppler Effect Sec 13.7 –

Advertisements

Sound.

As the police car approaches, the sound waves from its siren are compressed towards the observer. The intervals between waves diminish, which.

Doppler Effect gGE.

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

Doppler Effect & Redshift Gharib ESS

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

Have you ever been outside when an ambulance is passing by? Does the pitch of the ambulance sound higher as it approaches you and lower as it moves away?

Doppler's Effect Presented by : - Dr.R.K.Mishra PGT(Phy) JNV, Tenughat

1© Manhattan Press (H.K.) Ltd. Source moving Observer moving Observer moving 11.5 Doppler effect Both source and observer moving Both source and observer.

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

D OPPLER E FFECT. R ECAP FROM L AST WEEK … Intensity Level (a.k.a., loudness) Sound Intensity.

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

18 – 2 The Nature of Sound.

Doppler Effect.

Created by Joshua Toebbe NOHS 2015

Chapter 10: Sound Section 1: The Nature of Sound

The Doppler Effect Ch

Using What You’ve Learned About Electromagnetic Radiation and Sound (Acoustic Energy) to Measure Speed and Distance April 2007.

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.

THE DOPPLER EFFECT. When the source of a sound is moving towards you, the pitch sounds higher than that of the source. When the source moves away from.

Waves transmit energy through space and time.

Discuss this riddle with your partner:  How can a musician playing a single note on a horn change that note without changing the way he or she plays that.

The Doppler Effect Ch Objectives 1.Describe doppler effect 2.Describe bow waves 3.Describe sonic booms.

Doppler Effect Doppler effect- an observable change in frequency. As a moving object approaches an observer the frequency goes up, as is moves away the.

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.

Physics I Honors 1 Waves and Sound Intensity Doppler Effect.

Sources of Sound  sound is a mechanical wave produced by vibrations that occur in a medium-- generally air  sound is a longitudinal wave.

Waves. The time it takes for one wavelength to pass is called the period. The number of wavelengths passing at a given time is called frequency.

10.2 Essential Questions How is sound intensity measured?

Sound and the Doppler Effect. Sound Waves Sound is longitudinal compression wave. Despite this fact, we can still convert and remodel sound waves into.

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

1 Wave Interference: Beats 2 Beats Previously we considered two interfering waves with the same . Now consider two different frequencies. When 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 Christian Doppler This apparent change in frequency due to the motion of the source (or receiver) is called the Doppler effect. The.

Doppler Effect David William D. Ecoben III-Archimedes.

The Doppler Effect The sound of a police car siren changes as it moves past you. The pitch of the siren seems to change. Ahead of the car, the sound waves.

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

Unit: Sound and Light Lesson 2 Properties of Sound Essential Questions: 1.) What affects pitch? 2.) What affects loudness? 3.) What causes the Doppler.

Getting Ready for Notes Do your Warm Up. Be prepared to discuss with the class. Set up your IAN Notebook with Cornell Notes like the picture below.

Doppler Effect. Doppler Shift (p272)If there is relative motion between the source of a wave and the receiver of the wave the frequency received will.

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?

Sound Waves. Mechanical Waves Mechanical Waves – waves that need a medium to transport energy and travel through –EX: Sound, Water, Seismic.

Chapter 12 Section 2. Amplitude Amplitude of a sound wave indicates the amount of energy in the wave Longitudinal wave’s amplitude is the tightness of.

Sound Waves March 22-23, The nature of sound What is a tuning fork? How are they used? How do we know that sound is a wave? Visualizing sound waves.

Doppler Effect I. Imagine a bug bobbing up and down in the middle of a quiet puddle.

IP Moving wave sources Moving wave sources.

Doppler Effect.

The Doppler Effect THE LAST LECTURE.

10.2 Essential Questions How is sound intensity measured?

Doppler Effect & Shock Waves

Doppler Effect The apparent shift in frequency caused by the movement of the sound source or the movement of the observer. When the waves get crunched.

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.

Moving stars and changing colors

Electromagnetic Waves

How do we hear?.

Unit 1.4 Waves and Sound.

Doppler Effect.

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

Unit: Sound and Light Lesson 2 Properties of Sound

Doppler Effect.

Physics 1 Unit 3: Waves Part 3:

Doppler Effect.

Doppler Effect Christian Doppler.

Sound Waves, Pitch, and Loudness

The bug in the center of the puddle is bobbing up and down.

Topic 3 – Part III The Doppler Effect

Presentation transcript:

Imagine a bug jiggling its legs and bobbing up and down in the middle of a quiet puddle

What would happen to the waves if the bug began to swim forward, toward B?

What does that do to the frequency of the waves, in front of the bug and behind the bug? In front of the bug…the frequency ↑ Behind the bug…the frequency ↓

 bin/doppler.cgi?dir=t&vs=200&mode=wrap bin/doppler.cgi?dir=t&vs=200&mode=wrap

Pitch…. A man’s vocal chords vibrate slower than a woman’s…hence a lower voice=lower pitch

The Doppler effect causes the changing pitch of a siren In front of the car… the pitch ↑ Behind the car… the pitch ↓

Note: The change in loudness is not the Doppler Effect! It is the shift in frequency!  com/watch?v=Y5Kae CZ_AaY com/watch?v=Y5Kae CZ_AaY

Police use the Doppler effect of radar waves to measure the speeds of cars on the highway

2011, Aroldis Chapman reached back and threw a pitch to Andrew McCutchen of the Pirates. The pitch wound up being high and tight, not a location necessarily to be proud of, and yet he received a standing ovation. Why the standing ovation, you may ask? The stadium radar reading displayed a velocity of 106 MPH, a speed that has only been topped twice since baseball started recording pitch velocities.Pirates

 _AaY _AaY

 Named after Christian Doppler (Austrian)

When a source moves toward you, do you measure an increase or decrease in wave speed? Neither! It is the frequency of a wave that undergoes a change, not the wave speed.

How does the apparent frequency of waves change as a wave source moves?  The sound waves become more frequent (compressed together).  The sound waves become less frequent (stretched apart).