Physics-
General
Easy

Question

A narrow tube is bent in the form of a circle of radius R, as shown in the figure. Two small holes S and D are made in the tube at the positions right angle to each other. A source placed at S generated a wave of intensity I0 which is equally divided into two parts: One-part travels along the longer path, while the other travels along the shorter path. Both the part waves meet at the point D where a detector is placed. The maximum value of l to produce a maxim at D is given by

  1. pi R    
  2. 2 pi R    
  3. fraction numerator pi R over denominator 2 end fraction    
  4. fraction numerator 3 pi R over denominator 2 end fraction    

The correct answer is: pi R

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