5 ´ 1011 m The radius of sun is taken as 7 ´ 108 m Solution The ratio of the radius of electron’s orbit to the radius of
nucleus is (10–10 m)/(10–15 m) = 105, that is, the radius of the electron’s
orbit is 105 times larger than the radius of nucleus If the radius of
the earth’s orbit around the sun were 105 times larger than the radius
of the sun, the radius of the earth’s orbit would be 105 ´ 7 ´ 108 m =
7 ´ 1013 m