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

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
There is no interactive force between the molecules.

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Physics
The mass defect is the result of what action occurring?

Mass being converted to energy when protons and neutrons break apart in a nucleus
Protons and electrons being attracted to each other
Mass being converted to energy when protons and neutrons bind together in a nucleus
Energy being converted into moles of atoms when neutrons break apart protons

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