The energy of hydrogen atom in the \( \mathrm{n}^{\text {th }} \) orbit is \( \mathrm{E}_{\mathr...

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The energy of hydrogen atom in the \( \mathrm{n}^{\text {th }} \) orbit is \( \mathrm{E}_{\mathrm{n}} \), then the energy in the \( \mathrm{n}^{\text {th }} \) orbit of single ionised helium atom is
(a) \( \frac{E_{n}}{2} \)
(b) \( 2 \mathrm{E}_{\mathrm{n}} \)
(c) \( 4 \mathrm{E}_{\mathrm{n}} \)
(d) \( \frac{E_{n}}{4} \)
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