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

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Presentation transcript:

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

The Doppler Effect  + if the source is moving away from the observer  - if the source is moving towards the observer

The Doppler Effect The frequency of a moving sound source appears to change according to a stationary observer  + if the source is moving away from the observer  - if the source is moving towards the observer

The Doppler Effect If both the source and observer are moving: Note: Top operations if the objects are moving away from each other, bottom if they are moving towards

The Doppler Effect If both the source and observer are moving: Note: Top operations if the objects are moving away from each other, bottom if they are moving towards

Explain why the Doppler effect occurs only if the sound-emitting object is moving relative to the listener. Calculate the apparent frequency heard by a person if a car traveling at 110 km/h emits a sound with frequency 450 Hz. Assume that the car is moving at the melting point of ice. a) away from the listener. b) toward the listener.

As a racing car zooms by you, its pitch decreases by 20%. If the speed of sound is 345 m/s, how fast is the car traveling?