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- Means by which sound and light travel
- waves
- A wave vibrating at right angles to the direction of travel
- Transverse
- Part of a longitudinal wave where the wavelengths are the shortest
- Compression
- When light bounces off a surface
- Reflection
- Substance through which waves travel
- Medium
- The hightest point (peak) of a wave
- Crest
- The bending of light
- refraction
- Part of a longitudinal wave where the wavelengths are the longest
- rarefraction
- The lowest point of a wave
- Trough
- Measurement from one crest to the subsequent crest (or trough to trough), measured in hertz
- Wavelength
- A continuous, slight, shaking movement
- Vibration
- An object or substance that light can not travel through
- opaque
- Energy of the light is converted to different forms of internal energy
- absorption
- A wave that is an oscillation of matter, and therefore transfers energy through the matter
- Mechanical
- A wave of energy consisting of electric and magnetic fields, oscillating at right angles to each other
- Electromagnetic
- The distance on the wave that is measured from position of rest to the crest
- Amplitude
- Permitting light to pass through but diffusing it
- Translucent
- Permitting the uninterrupted passage of light
- Transparent
- The unit by which wavelengths are measured
- Hertz
- Waves that have vibrations along or parallel to their direction of travel
- Longitudinal
- The number of waves that pass a fixed point in a unit of time
- Frequency