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High-energy photons correspond to short-wavelength light while low-energy photons correspond to long-wavelength light.

In short, the answer is red.

For short-wavelengths (high energy photons) it would appear blue.

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12y ago
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10y ago

Photons with lower energy correspond to electromagnetic radiation with lower

frequency/longer wavelength.

In the visible band, the color with the lowest frequency is the last one you can see

on the RED end of the spectrum.

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12y ago

The energy per photon is proportional to its frequency. So the visible light with the

least energy per photon is the light with the lowest frequency / longest wavelength.

That's the last color you can see on the red end of the spectrum.

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Q: Which color has the least amount of energy per photon?
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