InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
Two circular disc `A` and `B` with equal radii are blackened. They are heated to same temperature and are cooled under identical conditions. What inference do your draw from their cooling curves? A. A and B specific heatB. Specific heat of A is lessC. Specific heat of B is lessD. Nothing can be said |
|
Answer» Correct Answer - B When a body cools by radiation, the rate of cooling is given by: `(d theta)/(dt) = (eAsigma)/(ms) (theta^(4)-theta_(0)^(4))` `-ve` sign shown that temperature decreases, i.e., the body cools, is the specific heat of materail and `theta_(0)` is teh surrounding temperature or, `(d theta)/(dt) prop 1/s` i.e., rate of cooling `(R = d theta//dt)` is inversely proportional to the specific heat of material. for a, rate of cooling is large, therefore, specific heat of `A` is smaller. |
|