The energy of an electron in the nth orbit of hydrogen atom is given by En = -(13.6/n^2)eV. Find energy required to take the electron from the ground state to the (i) first excited state , (ii) second excited state.

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Q. The ionization energy of hydrogen atom is

13.6

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_{n}

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^{t h}

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, then the energy required to excite the electron from ground state to second orbit is

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