Question

The following solid objects made of the same material are maintained
at a temperature of 300 K in an environment whose temperature is
400 K: a cube of edge r, a sphere of radius, r and
a hemisphere of radius r. The object in which the heat exchange is
the greatest ?
(a) Cube
(b) Sphere
(c) Hemisphere
(d) Equal in all
Two identical rods of metal are welded end to end as shown in​

Answer 1

Answer:

I think the answer is D equal in all

Answer 2

Answer:

equal in all .....

Explanation:

bcoz surface areas will be same