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Electromagnetic Waves and Communication System — Physics STD 11 Science — Question

Maharashtra BoardEnglish MediumSTD 11 SciencePhysicsElectromagnetic Waves and Communication System4 Marks
Question
Write short note on visible light.
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Answer

  1. It is the most familiar form of EM waves.
  2. These waves are detected by human eye. Therefore this wavelength range is called the visible light.
  3. The visible light is emitted due to atomic excitations.
  4. Visible light emitted or reflected from objects around us provides us information about those objects and hence about the surroundings.
  5. Different wavelengths give rise to different colours as shown in the table given below
     Colour Wavelength
     Violet 380-450 nm
     Blue 450-495 nm
     Green 495-570 nm
     Yellow 570-590 nm
     Orange 590-620 nm
     Red 620-750 nm

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