Final answer:
Joel is making use of sound energy when he listens to the radio. The speakers in the radio vibrate, producing sound waves that Joel can hear.
Step-by-step explanation:
Joel is making use of sound energy when he listens to the radio. Sound energy is a type of mechanical energy that travels in waves and is produced when an object vibrates. In this case, the speakers in the radio vibrate, producing sound waves that Joel can hear. The radio itself is converting electrical energy from the power source into sound energy.
Learn more about Sound Energy