1.

A planet of mass m moves around the sun in an elliptical orbit. The maximum and minimum distance of the planet from the sun is r_(1) and r_(2). The time period is proportional to:

Answer»

`r_(1)^(3//2)`
`r_(2)^(3//2)`
`(r_(1)+r_(2))^(3//2)`
`(r_(1)-r_(2))^(3//2)`

Solution :Here `T^(2)PROP ("length of major axis")^(3)`
`=((r_(1)+r_(2))/(2))^(3) or T prop (r_(1)+r_(2))^(3//2)`.
Correct choice is (c ).


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