1.

Earth is revolving around the sun. If the distance of the earth from the sun is reduced to 1/4th of the present distance then the day length reduced to :

Answer»

`1//4`
`1//8`
`1//2`
`1//6`

Solution :By Kepler.s third LAW `T^(2) prop r^(3)`
`therefore (T_(2))/(T_(1))=((r_(2))/(r_(1)))^(3//2)=((r//4)/(r ))^(3//2)=(1)/(8)`
`therefore T_(2)=(T_(1))/(8)`
Thus correct choice is (b).


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