What is meant by dispersion in a wave?

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what is meant by dispersion in a wave?
 

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arildno
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Effectively, it means how a wave signal becomes warped over time due to that different components of the wave travel with different velocities.

The two typical forms of dispersion is dispersion due to typical wave-length differences among wave components, and dispersion due to typical amplitude difference among wave components.
 
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thanks! :)
 

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