A) 2
B) 4
C) 6
D) 8
Correct Answer: B
Solution :
Idea This question is based on the concept of constructive and destructive interference of waves and its relation with path difference. At point P and Q path difference is equal to zero. So, point P and Q are parts y constructive interference, Now in points R and S path difference is equal to 1.5\[\lambda \], according to question path difference of 1.5\[\lambda \]also correspond, to point of constructive difference. So, P, Q, R, and S are 4 points around circle and are in constructive interference. TEST Edge Questions based on phase difference, path difference, constructive interference and destructive interference are frequently asked.You need to login to perform this action.
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