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Plants both reflect and radiate energy, but in different ways and at different wavelengths:

  1. Reflection:

Plants reflect energy primarily in the visible and near-infrared (NIR) parts of the electromagnetic spectrum.

In the visible spectrum, chlorophyll absorbs mostly blue and red light for photosynthesis, but reflects green light — which is why most plants appear green.

In the NIR range, plants reflect a significant amount of energy. This reflection helps regulate temperature and avoid overheating, as NIR energy doesn't contribute to photosynthesis.

  1. Radiation:

Plants also radiate thermal (infrared) energy, just like any other object with a temperature above absolute zero.

This radiation typically occurs in the mid- to far-infrared spectrum (thermal IR), corresponding to the plant’s temperature (usually around 290–310 K or 17–37 °C).

This is how thermal imaging can detect plant temperature and stress.

So in summary:

Reflect: visible (especially green) and NIR light

Radiate: thermal infrared energy (heat)

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Jai Dixit

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2mo ago

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