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Light and Sound Voca
Light and Sound Unit Vocabulary
| Question | Answer |
|---|---|
| Compression | The bunching up of molecules as vibration travels through matter |
| Rarefaction | The spreading out of molecules as vibration travels through matter |
| Amplitude | The amount of energy in a compression. Changes in amplitude affect loudness of sound. |
| Frequency | The number of wavelengths in a given period of time. Changes in frequency affect pitch. |
| Pitch | The high or low of sound. It is directly related to the frequency. High frequency results in high pitch. Low frequency results in low pitch. |
| Echolocation | Sound waves that hit an object and then bounce back toward the source of the sound. It is used by animals to locate food and avoid danger. |
| Sonar | Sound waves that hit an object and then bounce back toward the source of the sound. It is used by humans to locate objects. |
| Wavelength | The distance from a point on one wave to that same point on the next wave--usually from crest to crest or trough to trough. In a sound wave, wavelength is the distance between two compressions or two rarefactions. |
| Crest | The top of a wave |
| Trough | The bottom of a wave |
| Reflection | The bouncing back of light when it comes into contact with an object or substance |
| Refraction | The bending of light as it passes through an object or substance |
| Transparent | A material that allows most light to pass through it. Objects can be clearly seen through a transparent material. |
| Translucent | A material that allows some light to pass through it. Objects can be seen but not clearly through a translucent material. |
| Opaque | A material that does not allow light to pass through it. Objects cannot be seen through an opaque material. |
| Visible Spectrum | The part of the electromagnetic spectrum that can be seen by the human eye. Colors are red, orange, yellow, green, blue, and violet. |
| Prism | A tool that bends (refracts) white light into the colors of the visible spectrum and then disperses (separates) the light. |
| transmission | Light passing straight through an object. |
| compression wave | the way sound travels as vibrating matter with areas of compression and areas of rarefaction. |
| transverse wave | the way light travels typically in an up and down motion. |
| absorption | the taking in by a substance of light waves and converting the light energy to heat energy. |
| independent variable | what the experimenter changes in an experiment for an expected result |
| dependent variable | What may change as a result of the independent variable |
Created by:
klennartz
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