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  2. Solar traffic light - Wikipedia

    en.wikipedia.org/wiki/Solar_traffic_light

    Solar traffic lights are signalling devices powered by solar panels positioned at road intersections, pedestrian crossings and other locations to control the flows of traffic. They assign the right of way to road users by the use of lights in standard colors (red - amber/yellow - green), using a universal color code .

  3. Visible spectrum - Wikipedia

    en.wikipedia.org/wiki/Visible_spectrum

    The result is that red light is bent less sharply than violet as it passes through the prism, creating a spectrum of colors. Newton's observation of prismatic colors (David Brewster 1855) Newton originally divided the spectrum into six named colors: red, orange, yellow, green, blue, and violet.

  4. Photosynthetically active radiation - Wikipedia

    en.wikipedia.org/wiki/Photosynthetically_active...

    Green light, however, penetrates deeper into the leaf interior and can drive photosynthesis more efficiently than red light. [1] [2] Because green and yellow wavelengths can transmit through chlorophyll and the entire leaf itself, they play a crucial role in growth beneath the plant canopy. [3]

  5. Northern lights forecast for northern US, Midwest this week ...

    www.aol.com/northern-lights-forecast-northern-us...

    The aurora is expected to be bright and visible in multiple northern U.S. states Oct. 3 through Oct. 5 as well as from the lower Midwest to Oregon.

  6. Electromagnetic spectrum - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_spectrum

    By definition, visible light is the part of the EM spectrum the human eye is the most sensitive to. Visible light (and near-infrared light) is typically absorbed and emitted by electrons in molecules and atoms that move from one energy level to another. This action allows the chemical mechanisms that underlie human vision and plant photosynthesis.

  7. Sunlight - Wikipedia

    en.wikipedia.org/wiki/Sunlight

    The "solar constant" includes all types of solar radiation, not just the visible light. Its average value was thought to be approximately 1,366 W/m 2, [34] varying slightly with solar activity, but recent recalibrations of the relevant satellite observations indicate a value closer to 1,361 W/m 2 is more realistic. [35]

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