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Question

Assume that the total surface area of a human body is 1.6 m2 and that it radiates like an ideal radiator. Calculate the amount of energy radiated per second by the body if the body temperature is 37°C. Stefan constant σ is 6.0 × 10−8 W m−2 K−4.

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Solution

Given:
Area of the body, A = 1.6 m2
Temperature of the body, T = 310 K
From Stefan-Boltzmann law,

Energy radiatedTime= σAT4

Here, A is the area of the body and σ is the Stefan-Boltzmann constant.

Energy radiated per second = 1.6 × 6 × 10−8 × (310)4
= 886.58 887 J

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