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JEE · NEET Previous Year Question

$Considering the Bohr's model of hydrogen atom, the ratio of velocities of electrons orbiting in the 4^{th} orbit to that in the 9^{th} orbit is$

Topic: JEE PYQ

Answer: A. Full step-by-step solution below.

A $9 : 4$
B $3 : 2$
C $2 : 3$
D $4 : 9$

Correct answer: A

Solution

(a) V \propto \frac{1}{n} (∵ V = \frac{2.18 \times 10 ^{6}}{n}) \Rightarrow \frac{V _{4}}{V _{9}} = \frac{9}{4}

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