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Science Vocab Ch. 4

Waves, Light, and Sound; Lessons 1 - 3

Mechanical Wave A wave that travels only through matter.
Electromagnetic Wave A wave that can travel through empty space or through matter.
Transverse Wave A wave in which the disturbance is perpendicular to the direction the wave travels.
Longitudinal Wave A wave that makes the particles of a medium move back and forth parallel to the direction the wave travels.
Frequency The number of wavelengths that pass a point each second is a wave's ...
Amplitude A wave's ... is the maximum distance a wave varies from its rest position.
Refraction The change in direction of a wave as it changes speed, moving from one medium into another.
Radio Wave A low-frequency, low-energy electromagnetic wave that has a wavelength longer than about 30 cm.
Infrared Wave An electromagnetic wave with a wavelength shorter than a microwave but longer than light.
Ultraviolet Wave An electromagnetic wave with a slightly shorter wavelength and higher frequency than light.
Transparent A material that allows almost all of the light striking it to pass through, and through which objects can be seen clearly.
Translucent A material that allows most of the light that strikes it to pass through, but through with objects appear blurry.
Opaque A material which through light does not pass.
Intensity The amount of energy that passes through a square meter of space in one second.
Compression The region of a longitudinal wave where the particles of the medium are closest together.
Rarefaction The region of a longitudinal wave where the particles are farthest apart.
Pitch The perception of how high or low a sound seems.
Decibel (dB) The unit used to measure sound intensity or loudness.
Created by: stemljos4017