| Term | Definition |
|---|
| pitch | the preceived highness or lowness of a sound, dependiing on the frequency of sound waves |
| infrasound | any sound consisting of waves with frequenciess lower than 20 Hz |
| ultrasound | any sound consisting of waves with frequencies higher than 20,000 Hz |
| resonance | an effect in which the vibrations of one object causes tthe vibration of another object at a natural frequency |
| sonar | a system that uses reflected sound waves to determin the distance to, and location of, objects |
| photon | a particle of light |
| intensity | the rate at which light or any other form of energy flows through a given area of space |
| radar | a system that uses reflected radio waves to determine the distance to and location of objects |
| light ray | amodeol of light that represents light traveling through space in an imaginary straight line |
| virtual image | an image that forms at a point from which light rays appear t come but do not acutally come |
| real image | an image of an object formed by many light rays coming together ina specific location |
| total internal reflection | the complete reflection of light at the boundary between two transparent mediums when the angle of incidence exceeds that critical angle |
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