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Mech. Waves/Sound
17.3 and 17.4
| Question | Answer |
|---|---|
| reflection | occurs when a wave bounces off a surface that it cannot pass through |
| refraction | the bending of a wave as it enters a new medium at an angle |
| diffraction | the bending of a wave as it moves around an obstacle or passes through a narrow opening |
| interference | occurs when two or more waves overlap and combine together |
| constructive interference | occurs when two or more waves combine to produce a wave with a larger displacement |
| destructive interference | occurs when two or more waves combine to produce a wave with a smaller displacements |
| standing wave | a wave that appears to stay in one place-it does not seem to move through the medium |
| node | a point on a standing wave that has no displacement from the rest position |
| antinode | a point where a crest or trough occurs midway between two nodes |
| sound waves | longitudinal waves-compressions and rarefactions that travel through a medium |
| intensity | the rate at which a wave's energy flows through a given area |
| decibel | unit that compares the intensity of different sounds |
| loudness | a physical response to the intensity of sound, modified by physical factors |
| pitch | the frequency of a sound as you perceive it |
| sonar | a technique for determining the distance to an object under water |
| doppler effect | a change in sound frequency caused by motion of the sound source, motion of the listener, or both |
| resonance | response of a standing wave to another wave of the same frequency |
Created by:
mgorcz
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