Q. Q. The quantised energy of electron in hydrogen atom for the nth energy level is given by 
E n = - 13 . 12 n 2 × 10 5 J   m o l - 1
Calculate the minimum energy required to remove the electron completely from hydrogen atom When for its quantised energy level n equals 2. 
What should be the wavelength of light that can be used to cause this transition ? 

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