Solved papers for JEE Main & Advanced JEE Main Paper (Held On 12 May 2012)

done JEE Main Paper (Held On 12 May 2012) Total Questions - 2

• question_answer1) A hypothetical atom has only three energy levels. The ground level has energy, \[{{E}_{1}}=-8eV.\]The two excited states have energies, \[{{E}_{2}}=-6eV\]and\[{{E}_{3}}=-2eV.\]Then which of the following wavelengths will not be present in the emission spectrum of this atom?     JEE Main Online Paper (Held On 12 May 2012)
  A)
  207 nm                
  done clear
  B)
                         465 nm
  done clear
  C)
                         310 nm                
  done clear
  D)
                         620 nm
  done clear
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• question_answer2) A doubly ionised Li atom is excited from its ground state (n=1) to n=3 state. The wavelengths of the spectral lines are given by \[{{\lambda }_{32}},{{\lambda }_{31}}\]and\[{{\lambda }_{21}}.\]The ratio \[{{\lambda }_{32}}/{{\lambda }_{31}}\]and\[{{\lambda }_{21}}/{{\lambda }_{31}}\]are, respectively     JEE Main Online Paper (Held On 12 May 2012)
  A)
  8.1,0.67               
  done clear
  B)
                         8.1,1.2
  done clear
  C)
                         6.4,1.2                  
  done clear
  D)
                         6.4,0.67
  done clear
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