Doppler Shift + observer moving towards, - observer moving away, -source moving towards, + source moving away. v = speed of sound v o = observer speed.

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Presentation transcript:

Doppler Shift + observer moving towards, - observer moving away, -source moving towards, + source moving away. v = speed of sound v o = observer speed v s = source speed

A car is approaching an observer at 30 m/s and sounds its horn at 500 Hz. What frequency does the observer hear? 548 Hz

If the observer is driving at 30 m/s towards a stationary car which is sounding its horn, what frequency will the moving car hear? 544 Hz

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Tacoma Narrows Bridge