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The higher the frequency of light the greater its energy, so gamma rays and cosmic ray would accomplish the greatest amount of work. However I believe this question is directed towards plant photosynthesis.

So....

Plants on earth have adapted their photosynthetic pigments to be the most active in that frequency of light from the sun that has the most abundant energy to offer. The sun does emit high energy radiation but very little of it. Most of the radiation above the Ultra-violet is shielded by the Earth's atmosphere anyways so there is no use going after that. There is lots of energy in the lower UV that does make it to the surface of the Earth (as any sunburned sunbather will attest) but there isn't very much of it. The most abundant light from the sun is in the yellow range and that is the colour range that plants primarily exploit.

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βˆ™ 14y ago
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βˆ™ 5mo ago

Plants primarily absorb blue and red light for photosynthesis. So, a light source rich in these wavelengths, such as LED grow lights with a spectrum tailored for plants, would stimulate the greatest level of photosynthetic activity.

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Q: Which light would stimulate the greates level of photsysynethic activity?
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