By reducing the absolute temperature of a black body to half, the total energy radiated will be:
Correct answer: D. 1/16
- A. 4
- B. 16
- C. 1/4
- D. 1/16
Explanation
The total energy radiated by a black body is governed by the Stefan-Boltzmann law. Mathematically, it's expressed as: E=σT4where:E is the energy radiated per unit surface area,T is the absolute temperature of the body,and σ is the Stefan-Boltzmann constant. E'=σ(T/2)4 =σ(T4/16) =(1/16) σT4 E'=1/16ESo, if the absolute temperature of a black body is reduced to half, the total energy radiated will be reduced to 1/16th of its original value.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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