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

done JEE Main Paper (Held On 11 April 2014)

  • 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) \[\sqrt{\frac{2h}{m}\left( {{\lambda }_{o}}-\lambda  \right)}\]  

    B) \[\sqrt{\frac{2hc}{m}\left( {{\lambda }_{o}}-\lambda  \right)}\]

    C) \[\sqrt{\frac{2hc}{m}\left( \frac{{{\lambda }_{o}}-\lambda }{\lambda {{\lambda }_{o}}} \right)}\]             

    D) \[\sqrt{\frac{2h}{m}\left( \frac{1}{{{\lambda }_{o}}}-\frac{1}{\lambda } \right)}\]

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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) \[1.325\times {{10}^{-7}}m\]

    B) \[1.325\times {{10}^{-10}}m\]

    C) \[2.650\times {{10}^{-7}}m\]     

    D) \[5.300\times {{10}^{-10}}m\]

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JEE Main Online Paper (Held On 11 April 2014)
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