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In which colour is a solar cooker painted from the outside?
1. Green
2. Blue
3. Black
4. Red

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Correct Answer - Option 3 : Black

The correct answer is Black.

  • A solar cooker is painted black from the outside.

  • The black colour is used on the outer side because the black colour is known as the perfect absorber.
  • A solar cooker is a device that uses the energy from direct sunlight to heat, cook food materials. 
  • Sunlight is radiation generated by fluctuating electric and magnetic fields. 
  • When the photons of light waves interact with molecules of the substance the sunlight gets converted to heat.
  • The sunlight emitted by the sun possesses electromagnetic radiation in them.
  • When the sunlight strikes, the energy causes the molecules of the matter to vibrate and the molecules get excited and jump to higher levels. This activity generates heat.
  • A concave mirror is used in solar cookers.

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