Which Color Has the Longest Wavelength in the Visible Spectrum?

Discover why red light has the longest wavelength in the visible spectrum and its effects on atmospheric phenomena and practical uses.

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Red has the longest wavelength in the visible spectrum. It ranges from roughly 620 to 750 nanometers. The longer wavelength means that red light is less scattered in the atmosphere than blue light, which is why the sky appears red at sunrise and sunset. This characteristic of red's long wavelength also contributes to its use in various applications like low-visibility navigation and astronomy where minimal light scattering is desired.

FAQs & Answers

  1. What color has the longest wavelength in the visible spectrum? Red light has the longest wavelength in the visible spectrum, ranging from approximately 620 to 750 nanometers.
  2. Why does the sky appear red during sunrise and sunset? The sky appears red during sunrise and sunset because red light has a longer wavelength and is scattered less in the atmosphere compared to shorter wavelengths like blue light.
  3. How is red light's long wavelength used in practical applications? Red light's long wavelength causes minimal scattering, making it useful in low-visibility navigation and astronomy to reduce interference from atmospheric scattering.