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A sphere maintained at temperature 600 K, has cooling rate R in an external environment of 200 K temp.

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

(1) 3/16 R

(2) 16/3 R

(3) 9/27 R

(4) None 

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1 Answer

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Correct Answer is: (1) 3/16 R

According to stefan's law – 

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