Pete Bax
By: Pete Bax
Catalog ID: 703672   Duration: 0:36  
Genre: Mechanical sound effects (appliances, machinery) | Engines / big engines
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The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague. Commonly heard when a train passes a stationary person   Keywords: physics science electronics quantum mechanics wave technology radar satellites aircraft trains experiment college technology listening distances universities

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Long Description: Doppler Effect Train Education, Mechanical Sound Effects, Engines big engines, movie wavs, funny sound effects wav and sounds to download for powerpoint

Keywords: When the source of the waves is moving toward the observer, each successive wave crest is emitted from a position closer to the observer than the previous wave. Therefore, each wave takes slightly less time to reach the observer than the previous wave. Hence, the time between the arrival of successive wave crests at the observer is reduced, causing an increase in the frequency. While they are travelling, the distance between successive wave fronts is reduced, so the waves "bunch together". Conversely, if the source of waves is moving away from the observer, each wave is emitted from a position farther from the observer than the previous wave, so the arrival time between successive waves is increased, reducing the frequency. The distance between successive wave fronts is then increased, so the waves "spread out". Many aircraft use Doppler to Navigate over distances and so do certain weapons the frequency of all waves are higher the nearer you
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