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diff types of frequency

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Why do waves exist?

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Frequency over time

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Different frequencies

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measurement of length

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Frequencies, energy transferring

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movement

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Energy being transferred through a medium

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Transverse and longitudinal, propagation of energy.

Why do light waves not need a medium to travel through

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The entire electromagnetic spectrum travels in waves

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Changes in energy.

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signal frequencies

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How is light created?
movement of energy

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Fluctuations in energy

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movement of frequency

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frequency of particles traveling up and down.
why do wave frequencies vary?

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Up and down motions of something like the ocean or the air or energy

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Physical fluctuations

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frequent back and forth movement

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Frequencies that go up and down