A bucket full of hot water cools from 75 ° C to 70 ° C in time T 1 , from 70 ° C to 65 ° C in time T 2 and from 65 ° C to 60 ° C in time T 3 , then

Question

A bucket full of hot water cools from 75 ° C to 70 ° C in time T 1 , from 70 ° C to 65 ° C in time T 2 and from 65 ° C to 60 ° C in time T 3 , then, T 1 = T 2 = T 3, T 1 > T 2 > T 3, T 1 T 2 T 3, T 1 > T 2 T 3

MARKS App · Accepted Answer

According to Newton's law of cooling Rate of cooling ∝ Mean temperature difference ⇒ Fall in temperature Time ∝ θ 1 + θ 2 2 - θ 0 ∵ θ 1 + θ 2 2 1 > θ 1 + θ 2 2 2 > θ 1 + θ 2 2 3 ⇒ T 1 T 2 T 3

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