JEE Previous Year Question
A liquid cools from 70ºC to 60ºC in 5 minutes. Find the time in which it will further cool down to 50 ºC, if its surrounding is held at a constant temperature of 30ºC.
Topic: NEET PYQ
Answer: 7. Full step-by-step solution below.
Correct answer: 7
Solution
(7 minutes)= K
⇒= K [65 – 30] ...(i)
Now = K [65 – 30] ...(ii)
Dividing equation (i) and (ii)
=
t =
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