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# Physics past papers question watch

1. 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
2. (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
3. 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.
4. oh got it thank you so much and then I multiplied by 10^-3 since it's in milliseconds. Thanks again

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