Thanks for the great question! It turns out that plants use the portion of the solar spectrum that falls in the visible range (400 - 700 nm wave length) of the light spectrum. In other words, plants use all of the different colors of light that we can actually see to generate biological energy through photosynthesis. Also, in case you are interested, the visible range of the solar spectrum makes up about 45% of the total solar spectrum, meaning that plants can only use about half of the sun's emitted energy for photosynthesis.
I hope that this answer helps you out, and please feel free to send us other interesting questions in the future!
The color of light used for photosynthesis depends on the pigment in the plant.For example, green plants with chlorophylls and carotenoids have a maximum activity with violet-blue and red light. Basically, whatever color the plant is, that is the color of light that it is reflecting instead of absorbing and using for photosynthesis. If you click on the different links I have included, it will take you to different wikipedia pages that provide additional information.
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