"I love hearing that lonesome wail of the train whistle as the

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Waves and the Doppler Effect

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Presentation transcript:

"I love hearing that lonesome wail of the train whistle as the magnitude of the frequency of the wave changes due to the Doppler effect."

http://en.wikipedia.org/wiki/Doppler_radar A Doppler radar is a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the frequency of the returned signal has been altered by the object's motion.

The Doppler Effect- the change in wave frequency resulting from motion of the source or observer Consider the waves from a sound source: Now, consider the waves from a moving source: You hear a lower frequency as it moves away from you You hear a higher frequency as it moves toward you

NOT required in AP Physics1 Doppler or apparent frequency Velocity of wave medium NOT required in AP Physics1 Velocity of Sound source Sound source frequency Which to use + or - ? Use + if sound source is moving away (Away ~ Add ~ +) Use ─ if sound source is approaching

Doppler Shift Examples Red/Blue Shift: Police Radar:

Web link: The Doppler Effect and Sonic Booms Stationary Sound Source Source moving with vsource < vsound Source moving with vsource = vsound (Mach 1 - breaking the sound barrier ) Source moving with vsource > vsound (Mach 1.4 - supersonic) Web link: The Doppler Effect and Sonic Booms

Sonic Boom When the moving object speed reaches Mach 1 (breaking the sound barrier)