A body cool from 90°C to 70°C in 10 minutes if temperature of surrounding is 20°C find the time taken by body to cool from 60 °C to 30 °C. Assuming Newton's law of cooling isvalid:

see full answer

Take the SCORE scholarship exam from home and compete for scholarships worth ₹1 crore!*

An Intiative by Sri Chaitanya

10 min

24 min

36 min

8 min

answer is A.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

By Newton's law of cooling θ1-θ2t=kθ1+θ22-θ0 ⇒ 90-7010=k90+702-20and 60-30t=k60+302-20 ⇒20t10×30=6025⇒t=36 min.

Watch 3-min video & get full concept clarity