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        | What did the ancient greeks call smallest quantity of light |  | Definition 
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        | what are bundles of energy called? |  | Definition 
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        | small bundle of energy traveling through space at the speed of light is what? |  | Definition 
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        | light photons and x-ray photons are both part of: |  | Definition 
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        | Speed of light is equal to _____miles per sec. |  | Definition 
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        | Photons have no mass, and therefore no identifiable form, but they do have electric and magnetic fields that are continuously moving in a sinusoidal fashion, what is this called? |  | Definition 
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        | The rate of rise and fall of a sine wave is called: |  | Definition 
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        | The distance from one crest to another is called: |  | Definition 
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