Physics
The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be:

8 T
2 T
1 T
4 T

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Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero

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