Solved papers for JEE Main & Advanced JEE Main Paper (Held On 25 April 2013)

done JEE Main Paper (Held On 25 April 2013) Total Questions - 2

• question_answer1)                 In an experiment on photoelectric effect, a student plots stopping potential \[{{V}_{0}}\]against reciprocal of the wavelength \[\lambda \] of the incident light for two different metals A and B These are shown is the figure.                 Looking at the graphs, you can most appropriately say that:     JEE Main Online Paper ( Held On 25  April 2013 )
  A)
                  Work function of metal B is greater that that of metal A
  done clear
  B)
                                         for light of certain wavelength falling on both metal, maximum kinetic energy of  those emitted from B.
  done clear
  C)
                                         Work function of metal A is greater than that of metal B
  done clear
  D)
                                         Students data is not correct
  done clear
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• question_answer2)                 A copper ball of radius 1 cm and work function 4.47  eV us irradiated with ultraviolet radiation of wavelength \[2500{{\operatorname{A}}_{\circ }}\]. The effect of irradiation results in the emission of electrons form the ball. Further the ball will acquire                charge and due to this there will be a finite value of the potential on the ball. The charge acquired by the ball is:     JEE Main Online Paper ( Held On 25  April 2013 )
  A)
                  \[5.5\times {{10}^{-13}}C\]                         
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  B)
                                         \[7.5\times {{10}^{-13}}C\]
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  C)
                                         \[4.5\times {{10}^{-12}}C\]                         
  done clear
  D)
                                         \[2.5\times {{10}^{-11}}C\]
  done clear
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