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Waves-Science

Waves-7th grade Science

TermDefinition
What are waves? - Disturbance that transmits energy through matter or space. - Waves carry energy. - The material does not move with the energy. - Ex. Phone rings you don’t feel a rush of air.
What are the types of waves? Mechanical & Electromagnetic waves.
Mechanical Wave. A wave that requires a medium.
What are some examples of a Mechanical Wave? Sound waves, Ocean waves, and Guitar String.
Electromagnetic Wave. Are waves that do not “require” a medium but can travel through one.
What is a medium? Substance through which waves travel.
Transverse Wave. Transverse particles vibrate with an up and down motion.
Examples of a Transverse wave? Electromagnetic waves or a wave on a rope.
Parts of a Transverse wave? Crest- highest point Trough- lowest point
Longitudinal Wave. Particles of the medium vibrate back and forth along the path that the waves travel.
Examples of a Longitudinal Wave? Slinky or sound waves.
Parts of a Longitudinal wave. Compression and Rarefaction.
Rarefaction. Parts are less crowded.
Compression. Parts are crowded.
Surface Waves. Combination of transverse and longitudinal waves between two media (air and water).
Amplitude. Height of the wave.
Larger Amplitude. Taller wave and more energy.
Wavelength. The distance between any 2 adjacent crests.
Frequency. The number of waves produced in a given amount of time.
Formula. Wave Speed (velocity), Wavelength, Frequency Formula V = λ x f (λ= lambda)
Wave Speed. The distance traveled over time. Depends greatly on medium.
Units. Frequency= Hertz (Hz) Wave Speed= lambda Wavelength= (m)
Reflection. Occurs when a wave bounces back after striking a barrier.
Diffraction. The bending of waves around a barrier or through an opening.
Refraction. The bending of a wave as it passes at an angle from one medium to another.
Interference. Constructive crests or destructive crests.
Created by: 29catalanob
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