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aqa physics book as 6.2 using an oscilloscope?//

On page 77 of the aqa AS physics book it says that figure 2 shows an oscilloscope with a waveform height of 5cm..i count it more as 2.6 cm, the also say that the y gain is 0.5vcm^-1 but I tink its set at 5cm^-1...why am i getting really different values from a picture? D;
I don't think its to scale ;P you have to count the divisions and multiply them by the values given (assuming each division is a cm where the cm is not to scale but stated).

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