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Per NCERT, what comparative analogy does the textbook use to convey the relative sizes of the atom vs nucleus?
AIf a cricket ball represents a nucleus, the radius of the atom would be about 5 km
BNucleus is bigger than the atom
CBoth have nearly the same size
DAtom is 10× the nucleus
Answer & Solution
Correct answer: A. If a cricket ball represents a nucleus, the radius of the atom would be about 5 km
Per NCERT §2.2.2, atom radius ~10⁻¹⁰ m vs nucleus ~10⁻¹⁵ m — ratio 10⁵, like a cricket ball (nucleus) vs a 5-km-radius atom.
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