Physics-
General
Easy

Question

A detector is moving in a circular path of radius r in anticlock wise direction with a constant angular velocity w as shown in the figure. At time t=0, it starts from the location shown at A, assuming source at rest. The frequency as received by the detector when it rotates by an angle fraction numerator pi over denominator 2 end fraction

  1. open parentheses fraction numerator V minus r omega over denominator V end fraction close parentheses f    
  2. open parentheses fraction numerator V minus fraction numerator 2 over denominator square root of 5 end fraction r omega over denominator V end fraction close parentheses f    
  3. open parentheses fraction numerator V plus r omega over denominator V end fraction close parentheses f    
  4. open parentheses fraction numerator V plus fraction numerator 2 over denominator square root of 5 end fraction r omega over denominator V end fraction close parentheses f    

The correct answer is: open parentheses fraction numerator V minus r omega over denominator V end fraction close parentheses f

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