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| Numerical Relationship |
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| wavelength and
photon energy |
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| | Inverse relationship: Smaller
means more energetic |
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| | c = speed of light = 3.00 108 m/s |
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| | h = Plancks constant = 6.63 10-34 joule/s |
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| | Note: Joule is a unit of
energy 1 Joule/second = 1 Watt |
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| | Energy of a single photon of 0.5 m visible light? |
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| | Seems very small, but this is roughly the energy it takes to
chemically |
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| modify a single molecule. |
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| | Photons from a 100 W lightbulb
(assuming all
100W goes into light?) |
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