In an atom the ratio of radius of orbit of electron to the radius of nucleus is

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(c): The radius of orbit of electrons $=10^{-10} \mathrm{~m}$ radius of nucleus $=10^{-15} \mathrm{~m}$ \ $ 	herefore \quad 	ext { Ratio }=\frac{10^{-10}}{10^{-15}}=10^5 \ $ Hence the radius of electron orbit is $10^5$ times larger than the radius of nucleus.