UPSC Prelims 2009·GS1·science-and-technology·science and technology

Which one among the following has the highest energy?

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Last updated 23 May 2026, 3:31 pm IST
  1. ABlue lightCorrect
  2. BGreen light
  3. CRed light
  4. DYellow light

Explanation

The energy of light is determined by its wavelength. According to the principles of physics, the energy of a photon is inversely proportional to its wavelength. This means that shorter wavelengths have higher energy, while longer wavelengths have lower energy. Visible light follows the spectrum often remembered by the acronym VIBGYOR, which stands for Violet, Indigo, Blue, Green, Yellow, Orange, and Red. In this spectrum, violet and blue light have the shortest wavelengths and therefore the highest energy. Red light has the longest wavelength and the lowest energy. Among the options provided, blue light has the shortest wavelength compared to green, yellow, and red. Consequently, blue light carries the highest amount of energy.
science-and-technology: Which one among the following has the highest energy?

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