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bro .. can u help me again plz with ... eg when they say second wave has same frequency with phase difference of 90 degree .....q 5(ii) ..same paper may/june 2010 23 ..... and with 2 _ when they say a wave has 0.25T where T is time period ... same thing ... sketching ?? for both ... i find a lot of difficult in this :::::::::and can u tell me the way of finding the distance ,, i tried but never got it @gary221 salvatoreQuestion 2 (c) attached!
For the 3 (i), there's only one way. Split the graph into 3 parts minimum and calculate the area under graph. I believe cambridge have a range of values of the distance moved.