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Physics past papers question

A particular sound s investigated by connecting a microphone to an oscillope. The diagram shows the trace of a sound wave on the oscilloscope. The screen of the oscilliscope has a grid on it . On the x-axis 1 division represent 5 ms. the frequency of the sound wave is
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Avatar for Dowel
Dowel
8
Original post by Rosie1999
A particular sound s investigated by connecting a microphone to an oscillope. The diagram shows the trace of a sound wave on the oscilloscope. The screen of the oscilliscope has a grid on it . On the x-axis 1 division represent 5 ms. the frequency of the sound wave is


So I'm assuming you have a graph right?

frequency = 1/T when T is time period
so look at how many divisions 1 full wavelength crosses.
times the number of divisions by 5ms and thats your time period
then do 1/that to get frequency :smile:
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Avatar for nao123
nao123
7
frequency = no. of complete oscillations per second.
The oscilloscope is essentially a displacement-time graph; the time taken for 1 complete oscillation would be the period of the wave and hence the frequency would be the number of periods in 1 second => 1/p.
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Avatar for Rosie1999
Rosie1999
OP
1
oh got it thank you so much :smile: and then I multiplied by 10^-3 since it's in milliseconds. Thanks again :smile:

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