Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

[Q]: Constant random motion trait of particles causes even cold objects to have some thermal energy.
[A]: Which trait of particles causes even cold objects to have some thermal energy?

[Q]: When an atom gains or loses an electron it becames a(n) ion.
[A]: When an atom gains or loses an electron it becames an?

[Q]: When waves of two different frequencies interfere, beating occurs.
[A]:
When waves of two different frequencies interfere, what phenomenon occurs?