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JEE · NEET Previous Year Question

$On the basis of Bohr's model, the radius of the 3rd orbit is$

Topic: JEE PYQ

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

A $equal to the radius of 1 st orbit$
B $3 times the radius of 1 st orbit$
C $5 times the radius of 1 st orbit$
D $9 times the radius of 1 st orbit$

Correct answer: D

Solution

(d) For first orbit (n = 1), r_{1} = (\frac{1}{z}) \times 0.529Å For third orbit (n = 3), r_{3} = (\frac{9}{z}) \times 0.529Å Hence, r_{3} = 9 r_{1}

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