A wall consists of alternating blocks with length $d$ and coefficient of thermal conductivity $k_{1}$ and $k_{2} .$ The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is,

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Important Questions on Heat Transfer

MEDIUM

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 34

Three metal rods made of copper, aluminium and brass, each

20 cm

long and

4 cm

in diameter, are placed end to end with aluminium between the other two. The free ends of copper and brass are maintained at

100

and

0 ° C

respectively. Assume that the thermal conductivity of copper is twice that of aluminium and four times that of brass. The equilibrium temperatures of the copper-aluminium and aluminium-brass junctions are respectively-

HARD

NEET

IMPORTANT

Alpha Question Bank for Medical: Physics>Chapter 16 - Heat Transfer>Exercise-1>Q 35

The figure shows a system of two concentric spheres of radii $r_{1}$ and $r_{2}$ and kept at temperature $T_{1}$ and $T_{2},$ respectively. The radial rate of flow of heat in a substance between the two concentric spheres is proportional to:

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