A hot body, obeying Newton’s law of cooling is cooling down from its peak value 80 0 C to…
Physics · JEE Advanced · NTA Exams — Thermodynamics
A hot body, obeying Newton’s law of cooling is cooling down from its peak value 800C to an ambient temperature of 300C. It takes 5 minutes in cooling down from 800C to 400C. How much time will it take to cool down from 620C to 320C? (Given ln 2 = 0.693, ln 5 = 1.609)
- 3.75 minutes
- 8.6 minutes
- 6.5 minutes
- 9.6 minutes
Answer
(B) 8.6 minutes
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