Embibe Experts Solutions for Chapter: Heat Transfer, Exercise 3: Exercise (Conceptual Questions)

The layers of atmosphere are heated through

The lengths and radii of two rods made of same material are in the ratios $1 : 2$ and $2 : 3$ respectively; If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio:

Mud houses are cooler in summer and warmer in winter, because:

In which of the following phenomenon heat convection does not take place?

In natural convection a heated portion of a liquid moves because-

There is a black spot on a body. If the body is heated and carried in dark room, then it glows more. This can be explained on the basis of

Two spherical bodies $A$ (radius $6 \mathrm{cm}$) and $B$ (radius $18 \mathrm{cm}$) are at temperatures $T_1$ and $T_2$, respectively. The maximum intensity in the emission spectrum of $A$ is at $500 \mathrm{nm}$ and in that of $B$ is at $1500 \mathrm{nm}$. Considering them to be black bodies, what will be the ratio of the rate of total energy radiated by $A$ to that of $B$?

Two spheres of radii in the ratio $1 : 2$ and densities in the ratio $2 : 1$ and of same specific heat, are heated to same temperature and left in the same surrounding. Their rate of cooling will be in the ratio