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# Phase Difference help watch

1. Hi, pretty obvious physics is not my best subject (posting so many questions )

Can somebody work out this wave question for me?
This was the CCEA module 2 January 2005
Thanks!

2. Oo-er, haven't touched phase difference in a while.
I think (i) is 360/6 = 60 degrees, and (ii) is 'increased' by '180' degrees.

Edit: I realise I haven't explained myself very well. Well as far as I remember, one period or cycle of a wave is considered as 360 degrees (or 2pi radians). In the first question, the waves are shifted by 1/6 of a cycle, so their phase difference is 360/6 = 60 degrees. In the second question, the waves must be shifted by half a cycle, so that every positive crest interferes with a negative crest (this is most easily shown with a drawing). 360/2 is 180 degrees, hence my answer. Hope that helps

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