JEE Main 2014 — Thermal Properties of Matter Question with Solution
JEE Main 2014 (11 Apr Online)
Question
A hot body, obeying Newton's law of cooling is cooling down from its peak value to an ambient temperature of . It takes 5 minutes in cooling down from to . How much time will it take to cool down from to ? (Given , In )
Choose an option
Show full solutionCorrect option: B
Correct answer
B minutes
Step-by-step explanation
From Newton's law of cooling,
From question and above equation,
And,
Dividing equation (2) by (1),
On solving we get, time taken to cool down from to , minutes.
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This is a previous-year question from JEE Main 2014, covering the Thermal Properties of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.