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In terms of Bohr radius a₀, the radius of the second Bohr orbit of a hydrogen atom is given by

1. 4 a₀
2. 8 a₀
3. √2 a₀
4. 2 a₀

Correct answer: 4 a₀

Solution

The radius of the nth Bohr orbit is given by rₙ = n²a₀. For the second Bohr orbit (n=2), r₂ = 2²a₀ = 4a₀.

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