Question

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

• A. $10^{3}$
• B. $10^{4}$
• C. $10^{5}$
• D. $10^{6}$

Answer 1

Answer: (C)

$10^{5}$

Answer 2

The radius of orbit of electron $= 10^{10}m$

Radius of nucleus $= 10^{- 15}m$

$\therefore$ Ratio $= \frac{10^{- 10}}{10^{- 15}} = 10^{5}$

Hence the radius of electron orbit is $10^{5}$ times larger than the radius of nucleus.