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demonstrations:3_oscillations_and_waves:sound_waves:beat_notes:start

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Beat Notes

Description

Beating between two frequencies which are close to each other. Classes Used: PHYS 101, 153, 158

waves, beats Updated on: 06/19/13

Purpose

To demonstrate the audible beating between two frequencies which are close together.

Apparatus

Pair of organ pipes, two tuning forks, oscillators, or amplifiers and horn speakers

Setup

  • Two organ pipes, one with a variable frequency adjustment are sounded together. By moving the frequency adjustment of one pipe to obtain a frequency close to the other pipe will result with beats.
  • Two identical tuning forks on resonance boxes should be placed on the demonstration bench so that the open ends of the boxes are angled to face the audience. If one fork is now damped slightly with a damping piece attached to it, beats will be heard.
  • Two oscillators with their own speakers are driven producing two separated notes. Oscillator frequencies can be read off and the frequency of the beats heard matched approximately to the difference in frequency of the two oscillators. Providing the speakers and oscillators are nearly identical, an oscilloscope can be connected to show how close the frequencies are to each other.

Notes

Demo room information

Location —-
Maker Unknown
Current State Working
demonstrations/3_oscillations_and_waves/sound_waves/beat_notes/start.1548975513.txt.gz · Last modified: 2019/01/31 22:58 by demoroom