How Fuel Cells Work. Polymer Electrolyte Membrane (PEM) fuel cells used in automobilesâalso called Proton Exchange Membrane fuel cellsâuse hydrogen fuel and oxygen from the air to produce electricity. The diagram and animation below show how a PEM fuel cell works.
Sound is what happens when you transmit vibrations of energy through that matter. Sound is made up of wave vibrations. When you talk aloud, the motion of your vocal cords causes the air to vibrate. Air is made up of molecules, and as those air molecules vibrate, they hit each other.
We hear sound because vibrating particles vibrate our eardrums and our brain translates those vibrations into sound. 1. If sound is a form of energy, whatâs moving? 2. All sound comes from what? 3. What kind of a wave is sound? 4. What does frequency have to do with sound? 5. What does amplitude have to do with sound? 6. What made the balloon vibrate when we played sound over the speakers? Answers . 1. Energy is the ability to move something against a force. In the case of sound, molecules are moving. 2. Vibrations. No vibration, no sound. 3.