It is advisable to put on white cloth in summer, the reason is for white cloth

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MPPSC AE Mechanical Official Paper (Held on 3 July 2022)
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  1. α = 0, τ = 0 and ρ = 1
  2. α = constant
  3. ρ = 0, τ = 0 and α = 1
  4. None of the above

Answer (Detailed Solution Below)

Option 1 : α = 0, τ = 0 and ρ = 1
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Detailed Solution

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CONCEPT:

  • White and shiny surfaces are poor absorbers of heat and light whereas dark and black surfaces are the good absorber of heat and light.
    • A person with dark skin will experience more heat and mole cold in comparison to white skin people.

EXPLANATION:

  • We prefer white clothes in summer because white clothes reflect most of the sun's heat and absorb very little of the sun's heat and keep our body bodies.
  • When the body will be in black colors (Like Black cloths), all the light gets absorbed because black is the good absorber and bad reflector (ρ = 0, τ = 0, and α = 1) whereas white color body like (White cloths) emits or reflect all the light coming towards it (ρ = 1, τ = 0, and α = 0
  • So, for white color,

α = 0, τ = 0 and ρ = 1

So, the correct answer is option1.

Additional Information

  • Application of White colors:
    • Radiator in homes is painting with white.
    • We wear white cloth in summer because it reflects all the light and makes our body cool.

Additional Information

  • Dark people like people who live in Africa have the ability to absorb, an average of 36% heat or solar radiation than any other people in the world. 
  • There are no such bodies that are perfectly absorbing or emitting light, this means no light can be absorbed or emitted totally.

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