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If the electron in a hydrogen atom were in the energy level with \( n=3 \), how much energy in joule would be required to ionise the atom? (Ionisation energy of \( \mathrm{H} \)-atom is \( 2.18 \times 10^{-18} \mathrm{~J} \) ):
\( P \)
(A) \( 6.54 \times 10^{-19} \)
(B) \( 1.43 \times 10^{-19} \)
(C) \( 2.42 \times 10^{-19} \)
(D) \( 3.14 \times 10^{-20} \)
W.
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