Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A solid copper cube of edges 1 cm is suspended in an evacuated enclosure. Its temperature is found to fall from 100 
to 99 
in 100s. Another solid copper cube of edges 2 cm, with similar surface nature, is suspended in a similar manner. The time required for this cube to cool from 100 
to 99 
will be approximately
Text Solution
Verified by ExpertsThe correct answer is:
C
⇒ ⇒ For the same fall in temperature, time 
⇒ ⇒ dt 2 = 2 × × dt 1 = 2 × × 100 sec = 200 sec
[As A = 6a 2 and m = V × × ρ ρ = a 3 × × ρ ρ ]
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