List of top Physics Questions on Heat Transfer asked in AP EAPCET

Two metal rods \(A\) and \(B\) have lengths in the ratio \(1:2\), thermal conductivities in the ratio \(1:2\) and cross-sectional areas in the ratio \(1:4\). The ends of the two rods are maintained between the same temperature difference. Then the ratio of heat currents \[ \left(\frac{H_A}{H_B}\right) \] is

Three identical conductors A, B, and C are in contact. Thermal conductivities are k, 2k, and k/2 respectively. A is at $100^\circ C$ and C is at $0^\circ C$. During steady state, the junction temperature between A and B is nearly:

If the absolute temperature of a black body is tripled, the total radiant energy emitted per second per unit area increases by a factor of: