Q28 / 60 · IAT (IISER) 2025 · Chemistry

What is the time period of revolution of an electron in the fourth Bohr orbit of $\mathrm{He}^{+}$? [Bohr radius $=52.9$ picometers, mass of an electron $=9.11 \times 10^{-31} \mathrm{~kg}$, Planck's constant $=6.626 \times 10^{-34} \mathrm{Js}$ ]

Correct answer
A
2.4 femtoseconds
B
4.8 femtoseconds
C
24 femtoseconds
D
0.24 femtoseconds

Hence, the correct answer is option: 'A'.

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