TASK DEFINITION: In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.
PROBLEM: Question: What occurs when an unstable nucleus emits a beta particle and energy? Answer: beta decay

SOLUTION: Beta decay occurs when an unstable nucleus emits a beta particle and energy.

PROBLEM: Question: How does a neon light produce visible light? Answer: electroluminescence

SOLUTION: Electroluminescence does a neon light produce visible light.

PROBLEM: Question: What is the most commonly used source of energy in the world? Answer: oil

SOLUTION:
Oil is the most commonly used source of energy in the world.