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Light at the blue end of the spectrum penetrates most easily underwater. Why are seaweeds often yellow-brown?

April 26, 2017BLUE earth Geology light Mathematics sciences spectrum

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Light at the blue end of the spectrum penetrates most easily underwater. Why are seaweeds often yellow-brown?

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Yellow-brown objects absorb mostly blue and green light, reflecting the yellow and red. Yellow is the opposite of blue, as green is the opposite of red. For example, plants on the ground absorb mostly red light, which is why they look green.

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Because yellow-brown absorbs blue light – that’s why it appears yellow-brown if you observe it in white light. In blue light it would appear black.