====== Doppler Noise Maker ======

{{tag> doppler_shift oscillations_and_waves frequency located}}

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===== Description =====

Consists of an aluminum tube with a speaker, 3kHz frequency generator, and 9V battery mounted inside a large green foam ball (which has been reinforced with duct tape). A string with a rubber handle is attached to one end of the cylinder.

===== Purpose =====

To demonstrate the Doppler effect. 

===== Apparatus =====

  * Doppler Ball

===== Setup =====

The unit is a self-contained apparatus containing a battery, oscillator and a speaker that is small enough to be whirled around one's head on a length of cord.  Switch on and whirl around one's head at a reasonable speed and an apparent change in frequency will be observed by the class. Due to safety concerns, this demo has now been enclosed in a green foam ball in the event that the one operating the demo has poor grip or something else goes wrong. 

===== Notes =====

Useful Links: 	  
The BBC provides information on "Life, the Universe and Everything" originally started by Douglas Adams and provides quite a bit of trivia on the [[ http://www.bbc.co.uk/dna/h2g2/A827372 | Doppler Effect]].   Updated on: 06/19/13

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| **Location** | S3 |
| **Maker** | Unknown |
| **Current State** | Working |
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