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

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

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

Which to use + or - ? Doppler or apparent frequency Velocity of wave medium 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

You are standing still. What frequency do you detect if a fire engine whose siren emits at 1550 Hz moves at a speed of 32 m/s a) toward you? b) away from you? A train moving at a constant speed is passing a stationary observer on a platform. On one of the train cars, a flute player is continually playing the note known as concert A (f = 440 Hz). After the flute has passed, the observer hears the sound as a G which has a frequency of 392 Hz. What is the speed of the train? The speed of sound in air is 343 m/s. = 42 m/s

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

A Very Fast Plane mpeg file (1.32 MB) Sonic Boom When the moving object speed reaches Mach 1 (breaking the sound barrier) A Very Fast Plane mpeg file (1.32 MB)