how do we hear?
Post on 09-Feb-2016
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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. - PowerPoint PPT 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?
ULTRASOUND!
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