Two characteristics of the train's sound change.

Name them.

Loudness and

Frequency

(A.K.A. pitch)

Doppler Effect

School Blocks YouTube? Use the file below.

| Doppler_Effect.mov |

St. Mary's U. Astronomy and Physics

A bicyclist with a siren audibly demonstrates the Doppler effect (turn your speakers up!)
For more information on this and many other physics and astronomy demos, please visit: http://www.ap.smu.ca/demonstrations

Doppler Effect
St. Mary's Physics Online

D. Doppler Effect – variation in the observed frequency of a wave when there is relative motion between the source of the wave and the receiver

Doppler Effect V = 14 m/s
(B. Barrett)

Doppler Effect V = 18 m/s
(B. Barrett)

Stationary Ambulance? How can you tell?

Which way is this ambulance moving?

To the left

The Doppler Effect II
Colorado University

The Doppler Effect
Michael Fowler - Flashlets

"Which way is the

source of this wave

moving?"

"To the right, where

the frequency

is higher"

Doppler Effect - Mouse
St. Mary's HS Physics

Radar Guns & Waves
St. Mary's HS Physics

Review - The crack of a whip

Bullwhip_Cracking.mov

Did you know .....

The crack of a whip is the sound of the
tip breaking the speed of sound.

Interference