If you attach a signal generator to a speaker you can generate sounds with a specific frequency. By using two microphones and an oscilloscope you can find the wavelength of the sound waves generated. NOTE: the detected waves at each microphone can be seen as a separate wave on the oscilloscope.
Method
- Start with both microphones next to the speaker
- Slowly move one away until the two waves are aligned but exactly one wavelength apart (displayed on the oscilloscope)
- Measure the distance between the microphones to find the wavelength (λ)
- use the formula v = f x λ to find the speed (v) of the sound waves passing through the air. NOTE: the frequency is whatever you set the signal generator to.
Conclusion
Should all go well... you should find that the speed of sound in air is roughly 340 m/s
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