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24 Waves, Sound & Light
| Question | Answer |
|---|---|
| wave | a disturbance that moves through matter or space |
| transverse wave | a mechanical wave that causes particles in matter to move back and forth at right angles to the direction in which the wave travels |
| compressional wave | a mechanical wave that causes particles in matter to move back and forth along the same direction in which the wave travels |
| wavelength | the distance between a point on a wave and the nearest point moving with the same speed and direction |
| frequency | the number of wavelengths that pass by a point each second |
| law of reflection | the angle that the incoming wave makes with the normal equals the angle that the outgoing wave makes with the normal |
| refraction | the change in direction of a wave when it changes speed as it travels from one material to another |
| diffraction | the bending of waves around an object |
| intensity | the amount of energy that a wave carries past a certain area each second |
| pitch | the human perception of the frequency of sound (how high or high low a sound is) |
| reverberation | repeated echoes |
| electromagnetic waves | waves that can travel through natter or through empty space |
| electromagnetic spectrum | the complete range of electromagmetic wave frequencies and wavelengths |
| infrared waves | have wavelengths between .001 meters and 700 billionths of a meter |
| ultraviolet waves | have wavelengths between 400 billionths and 10 billionths of a meter |
| spectrum | a range of values or properties |
| perception | a recognition, sense, or understanding of something |
| density | the mass per cubic meter of a substance |