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JEE Main 2022 (25 Jun, Shift 1) · Bohr Model: Orbits, Speed & Angular Momentum

Bohr Model: Orbits, Speed & Angular Momentum question from JEE Main 2022 (25 Jun, Shift 1)

Q79JEE Main 2022 · 25 JUN · SHIFT 1Easy

Bohr Model: Orbits, Speed & Angular Momentum

The ratio for the speed of the electron in the 3rd orbit of He+ to the speed of the electron in the 3rd orbit of hydrogen atom will be:

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Answer: (d)

$v_n = 2.18 \times 10^6 \frac{Z}{n}\text{ m/s}$ , so $v \propto Z$ for the same $n$ .
$\frac{v_{He^+}}{v_H} = \frac{2}{1}$
So the answer is (d) $2 : 1$ .

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