The Energy of Light Video Lessons

Concept: The Energy of Light

# Problem: Carotenoids are yellow, orange, and red pigments synthesized by plants. The observed color of an object is not the color of light it absorbs but rather the complementary color, as described by a color wheel such as the one shown here. On this wheel, complementary colors are across from each other.If a particular carotenoid absorbs photons at 456 nm , what is the energy of the photon?

###### FREE Expert Solution

The energy of a photon can be calculated from:

Where h is Planck’s constant (6.626x10-34 J∙s) and v is the frequency (in Hz or s-1),

The frequency is related to the speed of light:

The frequency, v is:

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###### Problem Details

Carotenoids are yellow, orange, and red pigments synthesized by plants. The observed color of an object is not the color of light it absorbs but rather the complementary color, as described by a color wheel such as the one shown here. On this wheel, complementary colors are across from each other.

If a particular carotenoid absorbs photons at 456 nm , what is the energy of the photon?