Solved papers for JEE Main & Advanced JEE Main Paper (Held On 11 April 2015)

done JEE Main Paper (Held On 11 April 2015) Total Questions - 1

• question_answer1) A source of sound emits sound waves at frequency \[{{f}_{0}}.\]It is moving towards an observer with fixed speed \[{{\upsilon }_{s}}({{\upsilon }_{s}}<\upsilon ,\] where \[\upsilon \] is the speed of sound in air). If the observer were to move towards the source with speed \[{{\upsilon }_{0}},\] one of the following two graphs (A and B) will give the correct variation of the frequency f heard by the observer as \[{{\upsilon }_{0}}\]is changed. The variation of f with \[{{\upsilon }_{0}}\]is given correctly by: [JEE Main Online Paper (Held On 11 April 2015)]  
  A)
   graph A with slope \[=\frac{{{f}_{0}}}{(\upsilon -{{\upsilon }_{s}})}\]
  done clear
  B)
     graph A with slope\[=\frac{{{f}_{0}}}{(\upsilon +{{\upsilon }_{s}})}\]
  done clear
  C)
     graph B with slope \[=\frac{{{f}_{0}}}{(\upsilon -{{\upsilon }_{s}})}\]
  done clear
  D)
     graph B with slope\[=\frac{{{f}_{0}}}{(\upsilon +{{\upsilon }_{s}})}\]
  done clear
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