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Physics-

A small source of sound moves on a circle as shown in the figure and an observer is standing on O. Let n subscript 1 end subscript comma n subscript 2 end subscript and n subscript 3 end subscript be the frequencies heard when the source is at A comma blank B blankand C respectively. Then

Physics-General

  1. n subscript 1 end subscript greater than n subscript 2 end subscript greater than n subscript 3 end subscript    
  2. n subscript 2 end subscript greater than n subscript 3 end subscript greater than n subscript 1 end subscript    
  3. n subscript 1 end subscript equals n subscript 2 end subscript greater than n subscript 3 end subscript    
  4. n subscript 2 end subscript greater than n subscript 1 end subscript greater than n subscript 3 end subscript    

    Answer:The correct answer is: n subscript 2 end subscript greater than n subscript 3 end subscript greater than n subscript 1 end subscriptAt point A comma source is moving away from observer so apparent frequency n subscript 1 end subscript less than n (actual frequency) At point B source is coming towards observer so apparent frequency n subscript 2 end subscript greater than n and point C source is moving perpendicular to observer so n subscript 3 end subscript equals n
    Hence n subscript 2 end subscript greater than n subscript 3 end subscript greater than n subscript 1 end subscript

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