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Determining frequency of sound using a calibrated cathode ray oscilloscope

  • Thread starter RigidBody
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  • #1
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hi, i have an exam on wave properties in a week. and i found this on the syllabus. i cant remember learning it let alone what a cathode ray oscilloscope is (an electron gun thingymajig?) my textbooks dont explain it well. so if you know how to determine the frequency of sound using a calibrated cathode ray oscilloscope, please help. :eek: :bugeye: :cool: :confused: :surprised
 

Answers and Replies

  • #2
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A cathode ray oscilloscope is not much different from a voltmeter, except it visually displays voltage (x direction) vs. time (y direction).

Newer oscilloscopes have nice internal markers on the display, and are calibrated in a way that one can measure the period of the wave, the amount of time for one cycle of the sound wave occurs in.

Frequency = 1/period. This is how you calculate the frequency of the sound wave.
 
  • #3
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yay thanks
 
  • #4
berkeman
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Hammie said:
A cathode ray oscilloscope is not much different from a voltmeter, except it visually displays voltage (x direction) vs. time (y direction).
Small typo -- voltage is on the vertical y axis and time is on the horizontal x axis. Here's a link to a popular oscilloscope brand. You will probably recognize the instrument when you see it. To measure the period or frequency of a sound, you would connect your oscilloscope probe to a microphone output, and observe the time waveform on the 'scope display.

http://www.lecroy.com/
 

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