How do we hear?.

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Presentation transcript:

How do we hear?

Doppler Effect

Doppler Effect Due to moving sound source closer to source = greater frequency farther from source = lesser frequency as sound moves towards listener the sound can be a high pitched whine as sound moves away from listener the sound can be a drumming sound

Uses of the Doppler Effect Doppler radar police use it to determine speed of car the frequency of the reflected (echo) sound wave gives you the speed weather forecasters can use it to determine how fast a storm front is moving determine the speed of stars relative to Earth

Breaking the sound barrier! Why can’t I hear anything?

BOOM!!!

ULTRASOUND!