Q.

A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temperature. If its temperature falls to 400 K, the cooling rate will be:

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a

316R

b

163R

c

927R

d

364R

answer is A.

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Detailed Solution

Cooling rate ∞T4-T04So,        R'R=4004-20046004-2004=44-2464-24=316.
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A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temperature. If its temperature falls to 400 K, the cooling rate will be: