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

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

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Physics
Why are we able to hear short wave broadcasts better than long wave broadcasts ?

By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
Short waves are more energetic than long waves.
Short waves are unaffected by atmospheric disturbances.
Short wave broadcasts are made by nearby radio stations.

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