If temperature of a black body increases from 7°C to 287°C, then the rate of energy radiation becomes
5 times
16 times
4 times
2 times
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A bucket full of hot water is kept in a room and it cools from 75°C to 70°C in t1 minutes from 70°C to 65°C in t2 minutes and from 65°C to 60°C in t3 minutes; then