Solved papers for JEE Main & Advanced JEE Main Paper (Held On 11 April 2014)

done JEE Main Paper (Held On 11 April 2014) Total Questions - 2

• question_answer1) If \[{{\lambda }_{o}}\]and \[\lambda \] be threshold wavelength and wavelength of incident light, the velocity of photoelectron ejected from the metal surface is:   [JEE Main Online Paper ( Held On 11 Apirl  2014 )
  A)
  \[\sqrt{\frac{2h}{m}\left( {{\lambda }_{o}}-\lambda  \right)}\]  
  done clear
  B)
  \[\sqrt{\frac{2hc}{m}\left( {{\lambda }_{o}}-\lambda  \right)}\]
  done clear
  C)
  \[\sqrt{\frac{2hc}{m}\left( \frac{{{\lambda }_{o}}-\lambda }{\lambda {{\lambda }_{o}}} \right)}\]             
  done clear
  D)
  \[\sqrt{\frac{2h}{m}\left( \frac{1}{{{\lambda }_{o}}}-\frac{1}{\lambda } \right)}\]
  done clear
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• question_answer2) Based on the equation: \[\Delta E=-2.0\times {{10}^{-18}}J\left( \frac{1}{n_{2}^{2}}-\frac{1}{n_{1}^{2}} \right)\]the wavelength of the light that must be absorbed to excite hydrogen electron from level n = 1 to level n = 2 will be: \[(h=6.625\times {{10}^{-34}}Js,C=3\times {{10}^{8}}m{{s}^{-1}})\]   [JEE Main Online Paper ( Held On 11 Apirl  2014 )
  A)
  \[1.325\times {{10}^{-7}}m\]
  done clear
  B)
  \[1.325\times {{10}^{-10}}m\]
  done clear
  C)
  \[2.650\times {{10}^{-7}}m\]     
  done clear
  D)
  \[5.300\times {{10}^{-10}}m\]
  done clear
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