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--- demonstrations:3_oscillations_and_waves:sound_waves:doppler_noise_maker:start [2019/02/14 23:33] – external edit 127.0.0.1
+++ demonstrations:3_oscillations_and_waves:sound_waves:doppler_noise_maker:start [2020/02/13 23:11] (current) – demoroom
@@ Line 1: / Line 1: @@
 ====== Doppler Noise Maker ======
-{{tag>Dopple Ball needs_review untagged unlocated}}
+{{tag> doppler_shift oscillations_and_waves frequency located}}
 <WRAP box right>
-{{DopplerNoiseMaker_001.jpg?400|}}
+{{ :demonstrations:3_oscillations_and_waves:sound_waves:doppler_noise_maker:img_20190430_154243.jpg?400|}}
 // //
@@ Line 11: / Line 11: @@
 ===== Description =====
-Doppler Effect    Classes Used: PHYS 101, PHYS 153, ASTR 101
+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.
-waves, Doppler
-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
 ===== Purpose =====
+To demonstrate the Doppler effect.
-To demonstrate the Doppler effect.
 ===== Apparatus =====
+  * Doppler Ball
-Self-contained Doppler apparatus, green ball (to protect siren).
 ===== 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.
-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 Nerf ball in the event that the one operating the demo has poor grip.
 ===== 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
 <WRAP group>
 <WRAP half column>
+<WRAP box right>
+{{ :demonstrations:3_oscillations_and_waves:sound_waves:doppler_noise_maker:img_20190430_154332.jpg?400|}}
+</WRAP>
 </WRAP>
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 </WRAP>
 <WRAP tablewidth 100%>
-| **Location** | ---- |
+| **Location** | S3 |
 | **Maker** | Unknown |
 | **Current State** | Working |