Question

A solid sphere of radius R and a hollow
sphere of inner radius r and outer radius R
made of copper are heated to the same
temperature and are allowed to cool in the
same environment. Then, choose the
CORRECT statement :-
(1) Hollow sphere cools faster
(2) Solid sphere cools faster
(3) Both the spheres attain room temperature
at the same time
(4) The rate of loss of heat of the solid sphere
is twice that of the hollow sphere​

Answer 1

Answer: hollow sphere cools fater.

Explanation: because it is in more contact with external environment temperature hence it loose it energy quickly till then it attain temperature equal to the external environment.