Transmission Of Heat Question 345
Question: A sphere, a cube and a thin circular plate all made of the same material and having the same mass, are initially heated to a temperature of $ 200{}^\circ C $ . Which of these objects will cool slowest when left in air at room temperature?
Options:
A) the sphere
B) the cube
C) the circular plate
D) all will cool at same rate
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Rate of Cooling $ \propto $ Surface area and for a given mass, surface area of sphere is minimum.
BETA
