Visible Light


High Frequency Radiation - Concepts
Class - 9th Aus Edu Subjects
 
 
Concept Explanation
 

Visible Light

Visible light is a form of electromagnetic (EM) radiation, as are radio waves, infrared radiation, ultraviolet radiation, X-rays and microwaves. Generally, visible light is defined as the wavelengths that are visible to most human eyes. This broad range of wavelengths is known as the electromagnetic spectrum. It is the narrow region of electromagnetic spectrum, which is detected by the human eye. Its frequency is ranging from 4times1014 Hz. to 8times 1014 .It is produced due to atomic excitation.

Also we have few following points about visible light :

  •  The visible light emitted or reflected from objects around us provides the information about the world surrounding us.
  • We concentrate visible light to make lasers to use in everything from surgery, to CD players to laser pointers. Visible light waves also make our TV, computer and cell phone screens work.
  • The Sun is a natural source for visible light waves and our eyes see the reflection of this sunlight off the objects around us. The color of an object that we see is the color of light reflected. All other colors are absorbed. Light bulbs are another source of visible light waves.
  • Visible light is one way energy moves around. Light waves are the result of vibrations of electric and magnetic fields, and are thus a form of electromagnetic (EM) radiation. Our eyes perceive different wavelengths of light as the rainbow hues of colors. Red light has relatively long waves, around 700 nm long.
  • The sun produces visible light. Incandescent light bulbs, fluorescent, and neon lights are other examples of visible light that we may see on a regular basis. Visible light is probably the most important of all electromagnetic waves for most of us.
  • Relatively long radio waves are produced by electrical current flowing through huge broadcast antennas, while much shorter visible light waves are produced by the energy state fluctuations of negatively charged electrons within atoms.
  • It is a form of electromagnetic radiation which can be subdivided into seven colors. It's probably the most familiar to you because it is the only region on the spectrum that is visible to most human eyes.
  • The color components of visible light include violet, blue, green, yellow to orange, bright red and dark red. The full range of visible light wavelength stretches from about 340 nano meters to around 750 nano meters.
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    Sample Questions
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    Question : 1

    Visible light is one way ____________moves around .

    Right Option : B
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    Question : 2

    Visible Light Spectrum can be subdivided into _____________ colours.

    Right Option : B
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    Explanation
    Question : 3

    Life on earth is dependent on ______________.

    Right Option : B
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