Heat TransferHard
Question
The radii is of two spheres made of same metal are r and 2r. These are heated to the same temperature and placed in the same surrounding. The ratio of rates of decrease of their temperature will be
Options
A.1 : 1
B.4 : 1
C.1 : 4
D.2 : 1
More Heat Transfer Questions
Mud houses are cooler in summer and warmer in winter because...If the rates of loss of energy by unit area of an iron ball are E1 E2 and E3 when it cools from 75oC to 70oC, 70oC to 65...Which of the following statements is/are true ?...The temperature of a perfect black body is 727oC and its area is 0.1 m2. If stefan′s constant is 5.67 × 10-8 ...Two walls of thicknesses d1 and d2 and thermal conductivity k1 and k2 are in contact. In the steady state, if the temper...