Need help- Thermal problem?
A solid sphere (density p and specific heat capacity c) of radius r at an initial temperature 200K is suspended inside a chamber whose walls are at almost 0K.
The time required (in micron sec) for the temperature of the sphere to drop to 100K is-
1) 72/7 rpc/sigma
2) 7/72 rpc/sigma
3)27/7 rpc/sigma
4) 7/27 rpc/sigma
