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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 6.0×108W/m2K4.


A

608 J

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B

887 J

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C

1026 J

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D

902 J

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Solution

The correct option is B

887 J


Stefan's law: ΔQΔt=eσAT4

For an ideal radiator e = 1 ΔQΔt=6×108×1.6×(273+37)4

=6×108×1.6×314×104

= 887 J per second.


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