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Absorptivity of a body is equal to its emissivity
  • a)
    Under thermal equilibrium conditions
  • b)
    For a polished surface
  • c)
    At one particular temperature
  • d)
    At shorter wavelengths
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Absorptivity of a body is equal to its emissivitya)Under thermal equil...
In most case absorptivity of a body is equal to its emissivity under thermal equilibrium conditions.
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Absorptivity of a body is equal to its emissivitya)Under thermal equil...
Thermal Equilibrium Conditions
- Absorptivity and emissivity of a body are equal under thermal equilibrium conditions. This means that the rate at which a body absorbs radiation is the same as the rate at which it emits radiation when the body is in thermal equilibrium with its surroundings.

Explanation
- When a body is in thermal equilibrium, it means that the energy it absorbs from its surroundings is equal to the energy it emits. This balance of energy results in the absorptivity of the body being equal to its emissivity.

Significance
- This relationship is important in understanding the behavior of bodies at thermal equilibrium. It helps in predicting how much radiation a body will absorb and emit based on its surface properties.

Practical Application
- In practical applications, knowing that absorptivity equals emissivity under thermal equilibrium conditions allows engineers and scientists to design materials and systems that efficiently absorb and emit radiation as needed. This is crucial in fields such as solar energy, thermal insulation, and materials processing.
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Absorptivity of a body is equal to its emissivitya)Under thermal equilibrium conditionsb)For a polished surfacec)At one particular temperatured)At shorter wavelengthsCorrect answer is option 'A'. Can you explain this answer?
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