The light wave is how fast it goes up and down wavelength will be "frequency"
What is wavelength?
The separation between such a wave motion's crests and troughs would be known as the wavelength of a particular light.
What is frequency?
The frequency of a repeated event would be its number of instances per unit of time. Frequency in the context of light would be the count of wavelength repetitions per second.
Therefore, the light wave is how fast it goes up and down wavelength will be "frequency"
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