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RVFM Doppler Ball

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Brand: RVFM  MPN: 52-2678 
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This plastic ball has a tone generator and speaker inside and can be safely whirled round in a large horizontal circle to demonstrate the Doppler effect. Good output volume and variable pitch provide all that is required for a dramatic demonstration of the Doppler shift associated with a moving source.
  • Diameter 90mm
  • Powered by PP3 battery (supplied)


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