Heat and Thermal ExpansionHard

Question

There is a small hole in a container. At temperature should it be maintained in order that it emits one calorie of energy per second per meter2 :-

Options

A.10 K
B.500K
C.200 K
D.100 K

Solution

From Stefan′s law
⇒ ᐃQ = σAT4 ⇒ = 5.67 × 10-8 × 1× T4 ⇒ T = 100 K

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