Asked by Sophia
List three things that use light energy, and explain how they use it.
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- Plants (and other photosynthetic organisms) — Chlorophyll in plant leaves absorbs sunlight and uses that light energy to drive chemical reactions that turn carbon dioxide and water into glucose (sugar) and oxygen. The glucose stores chemical energy the plant uses for growth and metabolism.
- Solar panels (photovoltaic cells) — Photons from sunlight strike semiconductor material in the panel and transfer energy to electrons, freeing them and creating an electric current. That current is captured and used as electricity for homes, devices, or stored in batteries.
- Eyes (animals, including humans) — Photoreceptor cells in the retina absorb photons; that light energy causes chemical changes in visual pigments (opsins), which generate electrical signals. Those nerve signals travel to the brain and are interpreted as images, allowing vision.
- Solar panels (photovoltaic cells) — Photons from sunlight strike semiconductor material in the panel and transfer energy to electrons, freeing them and creating an electric current. That current is captured and used as electricity for homes, devices, or stored in batteries.
- Eyes (animals, including humans) — Photoreceptor cells in the retina absorb photons; that light energy causes chemical changes in visual pigments (opsins), which generate electrical signals. Those nerve signals travel to the brain and are interpreted as images, allowing vision.
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