Doppler Effect David William D. Ecoben III-Archimedes.

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

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

Refraction Minimize t with respect to x dt/dx=0 using dL 1 /dx=x/L 1 =sin  1 and dL 2 /dx=(x-d)/L 2 = -sin  2 dt/dx=(n 1 sin  1 - n 2 sin  2 )/c =

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

Doppler Effect Moving Source.

Doppler Effect.

PHY 102: Waves & Quanta Topic 5 Sound John Cockburn Room E15)

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 Angelourd T.Quibuyen and Ariel C. Alvarez Physics Department, Western Mindanao State University Normal Road, Baliwasan, Zamboanga City.

DOPPLER EFFECT This is the apparent change in the frequency of a wave motion as noted by an observer when there is relative motion between the source.

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.

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.

Created by Joshua Toebbe NOHS 2015

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.

2.4 Addition of waves Simulation bcs/Books?action=mininav&bcsId=4768&itemId= &assetId =160342&resourceId=15301&newwindow=true.

Doppler Effect Physics 11.

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.

R. Field 11/26/2013 University of Florida PHY 2053Page 1 Sound Waves: Doppler Effect Doppler Shift: If either the detector or the source of sound is moving,

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.

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.

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

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.

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

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.

Wave Phenomena Characteristics of Waves What is a wave? G A wave is a vibratory disturbance through a material (medium) or space G Waves transfer ENERGY.

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.

 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

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.

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

Physics. Wave and Sound - 5 Session Session Objectives.

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 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.

Doppler Effect The apparent change in the frequency of sound, caused by the relative motion between the source of sound and the observer, is called Doppler.

Today (Finish Chapter 13, Sound)  Temperature and Heat Concepts Tomorrow (Start Chapter 14)  Standing Waves  Beats  Doppler Effect  Example Problems.

WavesSection 2 Wave Properties 〉 What are some ways to measure and compare waves? 〉 Amplitude and wavelength are measurements of distance. Period and frequency.

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 The Doppler Effect is the change in the observed frequency caused by the motion of the wave source.

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.

What is the symbol of wavelength? Landa Back to front.

Oscillations about Equilibrium

PHYSICS and math OF SOUND

The Doppler Effect THE LAST LECTURE.

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.

Speed Formula - Waves.

Doppler Effect.

Moving stars and changing colors

Doppler Effect.

Doppler Effect and Red/blue Shift

Characteristics of Waves

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

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

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

Other terms related to a periodic wave

Doppler effect Eeeeeee – yowwwwwwwwww

Doppler Effect.

1 The Doppler shift explains

Sound, Decibels, Doppler Effect

Topic 3 – Part III The Doppler Effect

Presentation transcript:

Doppler Effect David William D. Ecoben III-Archimedes

The Doppler Effect on Waves  The apparent change in pitch produced by moving objects is called the Doppler Effect.  Sound waves undergo the Doppler Effect. When the source of the waves moves at a constant speed relative to you, the observer, the frequency of the wave as observed by you is shifted.

For sound, the shifted frequency f observed, in hertz, is given by:  f observed = f source x (v source - v observer ) (v source - v sound ) Where: F source = frequency in hertz at the source of the sound V source = the speed in m/s of the source of the sound V observer = the speed in m/s of the observer, v source – v observer = the relative speed in m/s of the source with respect to the observer, and V sound = the speed of sound in m/s.

Example 12.5 Emergency A fire truck siren emits a sinusoidal wave with a source frequency f source of 400 Hz. The speed of sound is 340 m/s. Find the wavelength of the siren while at rest. If the truck is moving with velocity v source = 40 m/s, find the wavelength of the siren going nearer to and then away from a stationary observer.

Given: Source frequency f source 400 Hz Velocity of source v source 40 m/s Velocity of the observer v observer 0 Find a. Wavelength if the source is at rest b. Wavelength if the source is nearing the observer c. Wavelength if the source is going away from the observer

Solution:  A. When source is at rest, using the equation v = f λ Solving for λ, λ = v source f source λ = 340 m/s / 400 Hz λ = O.85 m

 B. In front of the siren, since the object is getting farther, then the speed of sound relative to the observer is v – v s, so  λ = (v – v source ) / f source  = (340 m/s – 40 m/s) / 400 Hz  λ = 0.75 m

c. Behind the siren, since the object is going nearer, then the speed of sound relative to the observer is v + v s, so λ = (v + v source ) / f source = (340 m/s + 40 m/s) / 400 Hz λ = 0.95 m