Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction
Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave

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

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

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