AS Phsyics Question on waves Watch

helloyoongles
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How do you do Question (b) (ii) ?
I got that one period is 4ms, but how can I apply this to the question?
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hannah312
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If you know that the time period is 4ms then that is the time taken for one whole wavelength to pass a given point.
Hence after 2ms, the wave must have moved on by half a wavelength so the position of the string will be 180 degrees out of phase from original position.
After 5ms the wave has moved on by 1 and a quarter wavelengths so the position of the string must be 90 degrees out of phase with the original position.
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