A body at 500 K cools by radiating heat to ambient atmosphere maintained at 300

Question

A body at 500 K cools by radiating heat to ambient atmosphere maintained at 300 K. When the body has cooled to 400 K, the cooling rate as a percentage of original rate is about

Options:

A . 31.1

B . 41.5

C . 50.3

D . 80.4

Answer: Option A
Answer: (a).31.1

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