physical science chapt 10 and 11 sections 1,2
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20 terms
Terms | Definitions |
|---|---|
 wave | a repeating disturbance or movement that transfers energy through matter or space. |
| medium | a solid, liquid, gas , or combonation of these. |
| transverse wave | Matter in the medium moves back and forth at right angles to the direction that the wave travels. |
| compressional wave | Matter in the medium moves back and forth along the same direction that the wave travels. |
| crests | the high point in a transverse wave. |
| troughs | low point in a transverse wave. |
| rarefactions | less dense region of a compressional wave. |
| wavelength | the distance between one point on a wave and the nearest point just like it. |
| frequency | The number of wavelengths that pass a fixed point each second. |
| period | the amount of time it takes one wavelength to pass a point. |
| amplitude | related to the energy tranferred by a wave. |
| intensity | The amount of energy transferred by a sound wave through a certain area each second. |
| loudness | the human perciption of sound intensity. |
| decibel | a unit on the scale for sound intensity. |
| pitch | the human perception of the frequency of sound waves. |
| doppler effect | change in pitch or frequency due to the relative motion of a wave source. |
| opaque | material that absorbs or reflects all light and does not transmit any light, material in top candleholder(pg327). |
| translucent | material that transmits some light but not enough to see objects clearly through it. material in middle candleholder(pg327). |
| transparent | material that transmits almost all the light striking it so that objects can be clearly seen through it material such as the one in the bottom candleholder(pg327). |
| index of refraction | the ratio of the speed of light in a vacuum to the speed of light in the material. |
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