Practical: Measuring speed of sound

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How to set up equipment to find the speed of sound?

  1. Attach a signal generator to a speaker to generate set frequencies

  2. Set up oscilloscope attached to two microphones so waves are shown as separate for each

  3. Start with microphones next to each other then slowly move apart until the waves are aligned on the speaker but one wavelength apart

<ol><li><p>Attach a signal generator to a speaker to generate set frequencies </p></li><li><p>Set up oscilloscope attached to two microphones so waves are shown as separate for each</p></li><li><p>Start with microphones next to each other then slowly move apart until the waves are aligned on the speaker but one wavelength apart</p></li></ol>
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How to find wavelength

Measure the distance between the two microphones using a ruler

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How to find wavespeed?

Wave speed= frequency x wavelength

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What is the speed of sound in air?

330m/s