Solved papers for JEE Main & Advanced JEE Main Online Paper (Held on 9 April 2013)

done JEE Main Online Paper (Held on 9 April 2013) Total Questions - 2

• question_answer1) When two sound waves travel in the same direction in a medium, the displacements of a particle located at \['x'\] at time \['t'\] is given by:                 \[{{y}_{1}}=00.5\,\,\cos \,\,(0.50\,\pi x-100\pi t)\]                 \[{{y}_{2}}=0.05\,\,\cos \,\,(0.46\,\,\pi x-92\pi t)\]                 Where \[{{y}_{1}},{{y}_{2}}\] and \[x\] are in meters and t in seconds. The speed of sound in the medium is:                  JEE Main Online Paper (Held On 09 April 2013) 
  A)
  92 m/s                
  done clear
  B)
  200 m/s                
  done clear
  C)
  100 m/s                
  done clear
  D)
  332 m/s                
  done clear
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• question_answer2)                 An engine approaches a hill with a constant speed. When it is a distance of 0.9 km it blows a whistle whose echo is heard by the driver after 5 seconds. If the speed of sound in air is 330 m/s, then the speed of the engine is:                JEE Main Online Paper (Held On 09 April 2013)
  A)
                  32 m/s                
  done clear
  B)
                  27.5 m/s                                              
  done clear
  C)
                  60 m/s                 
  done clear
  D)
                         30 m/s                
  done clear
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