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Amplitude- A measurement from midpoint to crest (or trough) of a wave.
Crest- the upper most point on a wave.
Diffraction – Any bending of light by means other than reflection and refraction.
Doppler Effect – The change in frequency of a wave due to the motion of the source (or due to the motion of the receiver).
Electromagnetic Spectrum – The continuous range of electromagnetic waves that extends in frequency from radio waves to gamma waves.
Electromagnetic Waves – An energy-carrying wave produced when an electric charge accelerates.
Forced Vibrations – The setting up of vibrations in an object by a vibrating source.
Frequency – For a vibrating body, the number of vibrations per unit time. For a wave, the number of crests that pass a particular point per unit time.
Hertz (Hz)- A unit of frequency. 1 Hertz is equal to 1 wave per 1 second.
Interference – The combined effect of two or more waves overlapping.
Law of Reflection – The angle of reflection equals the angle of incidence.
Longitudinal Wave – A wave in which the medium vibrates in a directional parallel (longitudinal) with the directional in which the wave travels.
Natural Frequency – A frequency at which an elastic object naturally tends to vibrate.
Opaque – The term applied to materials that absorb light without reemission.
Period – The time required for a vibration or a wave to make a complete cycle. The inverse of frequency.
Reflection - The returning of a wave to the medium from which it came when it hits a barrier.
Refraction - The bending of waves due to a change in the medium.
Resonance – A dramatic increase in the amplitude of a wave that results when the frequency of forced vibrations matches an object’s natural frequency.
Transparent - The term applied to materials through which light can pass in straight lines.
Transverse Wave – A wave in which the medium vibrates in a direction perpendicular (transverse) to the direction in which the wave travels.
Trough- The lowest point of a wave.
Wave - A disturbance that travels from one place to another transporting energy, but not necessarily matter, along with it.
Wavelength – The distance from the top of one crest to the top of the next one, or, equivalently, the distance between successive identical parts of the wave.
Wave Speed- The velocity of the wave. It can be calculated with the following equation
Integrated Coordinated Science