If a body coated black at 600 K surrounded by atmosphere at 300 K has cooling rate r 0 . If the same body is again coated black at 900 K and surrounded by the same atmospheric temprature then its cooling rate equals to

Question

If a body coated black at 600 K surrounded by atmosphere at 300 K has cooling rate r 0 . If the same body is again coated black at 900 K and surrounded by the same atmospheric temprature then its cooling rate equals to, 16 3 r 0, 8 16 r 0, 16 r 0, 4 r 0

MARKS App · Accepted Answer

Cooling rate ∝ T 4 - T 0 4 ⇒ r = 900 4 - 300 4 600 4 - 300 4 r 0 ⇒ r = 16 3 r 0

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