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13 terms

7th Grade Science: Waves Set #1

STUDY
PLAY
Matter
A substance that takes up space and has mass.
Energy
The ability to cause a change in matter.
Wave
A recurring disturbance that carries energy, but not matter.
Medium
A solid, liquid or gas. Mechanical waves require this to transfer energy.
Mechanical Wave
A type of wave that requires a medium (matter) to transfer energy.
Electromagnetic Wave
A type of wave that does not require a medium to transfer energy. This type of wave can transfer energy through empty space or through matter.
Crest
The top peak of a transverse wave.
Trough
The bottommost point of a transverse wave.
Rarefaction
The area in a compressional wave where there is less matter in an area as the wave passes through the matter.
Compression
The area in a compressional wave where there is more matter in an area as the wave passes through the matter.
Wavelength
The distance between two adjacent crests or troughs of a transverse wave.
Transverse Wave
Matter in the medium vibrates up and down at a right angles to the direction the energy is transferred.
Compressional Wave
Matter in the medium vibrates back and forth in the same direction as the energy is transferred.