Moderate

In Bohr's model, atomic radius of the first orbit is y, the radius of the third orbit is:

Correct answer: D. 9y

A. y/3
B. 3y
C. y
D. 9y

Explanation

Radius of nth orbit of an electron is given by: rn = yn2/z . For hydrogen atom, z = 1 rn = yn2 For third orbit, n = 3 Thus radius of third orbit willl be : r3 = y * 32 r3 = 9y Hence, option D is correct.

Last updated 1 September 2026

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In Bohr's model, atomic radius of the first orbit is y, the radius of the third orbit is:

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