Spellzone list 

Key words for GCSE Physics
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medium |
The word medium is used to describe the material a wave passes through.
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reflected |
If a wave is reflected, it means it is not absorbed by a surface but bounced off it.
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boundary |
A boundary is the barrier between two materials.
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interface |
Interface is another word for boundary.
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absorbed |
If something absorbed, it means it soaked up.
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transmitted |
If energy is transmitted, it means it is moved.
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electromagnetic |
Electromagnetic waves are transverse waves that transfer energy.
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vacuum |
If something is a vacuum, it means it is empty of all materials.
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refracted |
A refracted wave changes direction when it hits a boundary.
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ultrasound |
Ultrasound refers to sound waves with a frequency that's too high to be perceived by the human ear.
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density |
Density is the ratio of mass to volume.
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