Physics
Stationary wave is formed by

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

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

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