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

Slides:

Advertisements

Similar presentations

Doppler Effect Introduction In our everyday life, we are used to perceive sound by our sense of hearing. Sounds are the vibrations that travel through.

Advertisements

Physics Waves Lecture Notes Download

Types of Waves Compression wave oscillations are in the direction of motion Transverse Wave oscillations are transverse to the direction of motion.

A submarine travelling at a speed of 10ms -1 “pings” an underwater sonar detector which is directly inline with the submarine. The broadcast frequency.

WAVES PROPERTIES Chapter 11, Section 3. What is a wave? A wave is a disturbance that carries energy through matter or space.

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

Doppler Effect Moving Source.

Doppler Effect.

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.

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,

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

THE DOPPLER EFFECT Section 9.5. Key Terms  Doppler Effect.

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.

Before the bell rings, in your notes, write out the important aspects of a correctly designed experiment. Make sure to include a description of your variable.

Chapter 10: Sound Section 1: The Nature of Sound

Chapter 15 - Sound Sound wave is a longitudinal wave.

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.

Chapter 14 Sound. Characteristics of sound 2 A special and important type of mechanical wave Speed of sound: Loudness: related to the energy of sound.

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.

Astrophysics and Cosmology The Wavelengths get “squished” in the direction of motion, and “stretched” in the opposite direction. Doppler Shift Longer,

Sound Waves You Have to Hear This!!!! Producing a Sound Wave Like all waves, sound waves are produced by a ________.  A tuning fork ________ to produce.

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.

Goal: To understand sound Objectives: 1)To learn about Sound waves 2)To understand the Speed of sound 3)To learn about Doppler Shifts 4)To learn about.

Doppler Effect Change in frequency when a source of sound is moving relative to an observer. Source of sound moving Source of sound stationary Hears lower.

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

The Doppler Effect.

 For source moving away from observer, wavelength increases  Following the same procedures gives   For source moving away, f o

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

The Doppler Effect ► Time to demonstrate ► Please cooperate ► See you downstairs, outside by the main entrance in three minutes ► Any questions??? ► Let’s.

Use your imagination … … to describe what’s happening in the following audio clip.

REVISION SOUND.

Physical Science Waves

Doppler Effect David William D. Ecoben III-Archimedes.

The Doppler Effect. Shown by all types of waves Properties of Waves Waves are characterized by two numbers: Wavelength,  (size of the wave) Frequency,

The Expanding Universe Additional reading: Higher Physics for CfE, p Notes p.42 Watch or listen to the following video clips:

Physics. Wave and Sound - 5 Session Session Objectives.

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

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 Textbook: 13.5 Homework: pg. 473 # 18, 19 pg. 476 # 64 – 71.

WavesSection 2 Bellringer In the diagram, A is the distance from a point on one wave to an identical point on the next wave. What might this distance be.

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.

Key Areas covered The Doppler effect is observed in sound and light The Doppler effect causes shifts in wavelengths of sound and light.

Sound and the Doppler Effect. Sound All sounds are produced by the vibrations of material objects They are compressional waves carried by a medium (air,

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.

 MRI is non-invasive, but it is expensive.  We can use different non-invasive techniques instead.  Non-invasive techniques do not involve ionising.

IP Moving wave sources Moving wave sources.

Wave speed equation v=ƒλ.

The Doppler Effect THE LAST LECTURE.

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.

What is the period of oscillation of the pendulum?

Resonance, Doppler effect

Doppler Effect.

Doppler Effect and Interference

Doppler Effect.

Doppler Effect.

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.

Calculating Wave Speed

Doppler effect Eeeeeee – yowwwwwwwwww

Harmonic Motion and Mechanical Waves

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

Doppler Effect Waves and Sound

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

Key Areas covered The Doppler effect is observed in sound and light

The Doppler Effect.

Doppler effect Eeeeeee – yowwwwwwwwww

Doppler Effect.

1 The Doppler shift explains

Doppler Effect.

Goal: To understand sound

Presentation transcript:

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

Stationary source production of sound waves Velocity of source (v s ) = 0 Both women hear the same sound (pitch)

Moving source production of sound waves Velocity vector in direction (v s ) has positive value Hears lower pitch – longer λ hears higher pitch – shorter λ

HOW DOES IT WORK??? Let’s start with a review of equations: λ = V (wave) / f units: m (per wave) f = V (wave) / λ units: waves / s T = λ / V (wave) = 1 / f units: s / wave

How about a visual here Stationary source: 1 pulse/s (siren)  Moving pulse: 1 pulse/s (siren v =.5m/s)

λ = 1m λ’ =.5m λ’ (m/wave) = λ (m/wave) - V siren (m/s) x period (s/wave) λ’ = λ - (V siren)(T) Δ λ = λ – λ’ = λ - λ - V siren (λ/V sound) Δ λ = V siren (λ) / V sound

Fun and exciting question for you: If a siren wave frequency is 1600 Hz And the V of the siren is 25 m/s Then what is the frequency of the siren as heard by an observer (as the siren moves toward the observer)?

You need the λ and the period to solve λ = V sound / f = 343 / 1600 =.214 m T = 1/f = 1/1600 = 6.25 x s/wave Now calculate λ’ λ’= λ – V siren (T) =.214 m/wave – (25 m/s x 6.25 x s/wave) =.198 m f’ = V sound / λ’ = 343 /.198 = 1732 Hz