GS PrelimsScience and TechnologyGeneral Science2009

Which one among the following has the highest energy ?

Blue light

Green light

Red light

Yellow light

Correct Answer: Option A

Explanation

1. The energy of a photon of light is inversely proportional to its wavelength (E = hc/λ, where λ is wavelength) and directly proportional to its frequency (E = hf). 2. Visible light spectrum ranges from Red (longest wavelength, lowest frequency, lowest energy) to Violet (shortest wavelength, highest frequency, highest energy). 3. The order of colors from lowest to highest energy is: Red Yellow Green Blue Blue light has the shortest wavelength and therefore the highest energy.

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