9.3 Waves and Energy

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US History

13 Colonies

9th

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33 Terms

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Absorption
Energy of a wave is taken in by an object
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Amplitude
The height of a wave
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Angle of incidence
The angle that a light wave hits an object
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Conduction
When energy flows through an object due to the collision of particles
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Convection
When heat energy flows through liquids and gases by expansion and contraction
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Converging rays
When light rays move towards the same point
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Crest
Peak of a wave
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Diverging rays
When light rays move away from the same point
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Electromagnetic radiation
Waves of energy formed in an electromagnetic field
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Energy
A property of matter that allows work on, or to heat, an object
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Frequency
Number of waves that pass a fixed point in a given amount of time
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Heat
Energy stored in the slight movement of particles within objects
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Hertz
Unit of measurement for frequency of waves
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Kinetic energy
Energy of an object due to its motion
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Light
A form of electromagnetic radiation that is detected by the human eye
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Longitudinal wave
Wave that displaces the medium through which it passes in the same direction as it travels
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Medium
The material through which a wave passes
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Opaque
When light cannot pass through an object
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Particle model
Model that explains the movement of particles in a substance
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Potential energy
The energy possessed by an object due to its position relative to others
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Primary colours
The three colours from which all other colours can be derived by mixing
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Radiation
Energy that travel away from an object
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Reflection
When a wave changes direction at the surface of an object returning to the medium from which it came from
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Refraction
When a wave changes direction when passing from one medium to another
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Secondary colour
Colour formed when two primary colours are mixed
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Sound
An audible pressure wave that propagates through a medium such as a gas
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Speed
The distance a wave travels in a given amount of time
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Translucent
A semi-transparent object that allows some light through
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Transparent
An object that allows light to travel through it unchanged
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Transverse wave
A wave whose vibration is at right angles to its direction
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Trough
Bottom most point of a wave
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Wave
A disturbance in a medium that allows the transfer of energy
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Wavelength
The distance over which a wave's shape repeats