TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Radioactive decay can give off energy and particles.

SOLUTION: Radioactive decay can give off energy and what else?

PROBLEM: The human eye detect can detect three colors of light.

SOLUTION: How many colors of light can the human eye detect?

PROBLEM: A vapor light produces visible light by electroluminescence process.

SOLUTION:
A vapor light produces visible light by what process?