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The energy of an electron in the first Bohr orbit of hydrogen atom is –2.18 × 10 –18 J. Its energy in the third Bohr orbit is ___________.

1. 9 1 th of the value
2. 27 1 of this value
3. Three times of this value
4. One third of this value

Correct answer: 9 1 th of the value

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