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| Question | Answer |
| Longitudinal Waves | Particles in a longitudinal wave move. A longitudinal wave is defined as displacing individual particles parallel to the direction of propogation of the wave. An example is sound. When you speak, the vibrations in your vocal cords create a series of compressions and expansions (rarefactions) in the air. The same kind of situation occurs with a loudspeaker, as illustrated in Figure 14-3. Here we see a speaker diaphragm vibrating horizontally with simple harmonic motion. As it moves to the right it compresses the air momentarily; as it moves to the left it rarefies the air. A series of compressions and rarefactions then travel horizontally away from the loudspeaker with the speed of sound. The figure also indicates the motion of an individual particle in the air as a sound wave passes. Note that the particle moves back and forth horizontally; that is, in the same direction as the propogation of the wave. The particle does not travel with the wave-each individual particle simply oscillates about a given position in space. |
| Propogation | Technical definition of a propogation |
| Water wavest | If a pebble is dropped into a pool of water, a series of concentric waves move away from the drop point. This is illustrated by a wave that propogates symmetrically away from a disturbance. The crests and troughs form concentric circles on the surface of the water as they move outward. Each element of water moves both vertically and horizontally as the wave propogates by in the horizontal direction. In this sense, a water wave is a combination of both transverse and longitudinal waves. |
| X | E is a vector quantity. Electric field is not a property of an object instead it's a property of space around the charge if the electric force has no charge. Electric field can exist without electric force. Vector direction is determined by q charge. |
| Electric potential/voltage | How much energy per coulomb |
| Force |
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