# 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) $\sqrt{\frac{2h}{m}\left( \frac{1}{{{\lambda }_{o}}}-\frac{1}{\lambda } \right)}$

• 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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