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Electromagnetic waves
Longitudinal waves
Transverse waves
Displacement
Amplitude
Wavelength
One complete cycle of a wave
Period
Frequency
Phase difference
Wavefronts
Reflection
Refraction
Diffraction
Principle of superposition
Supercrest
Supertrough
When a trough meets a crest
Stationary waves
Progressive waves
Nodes
Interference
Pitch
