Which energy do you hear in a running engine?

Which energy do you hear in a running engine?

• A. Pitch
• B. Light Energy
• C. Sound Energy
• D. Electrical Energy

Answer: (C)

When something makes noise, the energy you’re hearing is sound energy. A running engine makes its parts vibrate, creating pressure waves in the air. Those waves carry energy as they travel to your ears, and your brain perceives them as sound. Pitch is just how high or low the sound is, determined by frequency—not a different energy type. Light energy would be seen, not heard, and electrical energy is a way to power devices, not something you hear directly unless it’s converted into sound.

When something makes noise, the energy you’re hearing is sound energy. A running engine makes its parts vibrate, creating pressure waves in the air. Those waves carry energy as they travel to your ears, and your brain perceives them as sound. Pitch is just how high or low the sound is, determined by frequency—not a different energy type. Light energy would be seen, not heard, and electrical energy is a way to power devices, not something you hear directly unless it’s converted into sound.