K.C.S.E Physics Q & A - MODEL 2009PP2QN19
​Figure 12 shows a set up for observing interference of waves from two sources S1 and S2. The points C and D represent positions of the constructive and destructive interference respectively as observed on the screen
​(a) If the observation was made in a ripple tank, describe:
(i) How the constructive and destructive interferences are identified (b) Explain how the constructive interference C and the destructive interference D patterns are produced. Draw: (i) The line joining all points where waves from S1 and S2 have traveled equal distance. Label it A (ii) The line joining all points where waves from S2 have traveled one wavelength further than the waves from S1. Label it B.
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