Two objects `A`& `B` have exactly the same shape and are radiating the same power If their temperatures are in the ratio `sqrt3 : 1` then the ratio of their emissivities is .

Two lead spheres at the same temperature have radii in the ratio 1 :2. What is the ratio of their heat capacities?

Two discs of same material have the same mass. If their thickness are in the ratio 1:3 , then their moment of inertia are in the ratio

Two metallic spheres S_1 and S_2 are made of the same material and have got identical surface finish. The mass of S_1 is thrice that of S_2 . Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. the ratio of the initial rate of cooling of S_1 to that of S_2 is (a)1/3 (b)1/(sqrt3) (c) (sqrt3)/1 (d) (1/3)^(1/3)

Two metallic spheres S_1 and S_2 are made of the same material and have got identical surface finish. The mass of S_1 is thrice that of S_2 . Both the spheres are heated to the same high temperature and placed in the same room having lower temperature but are thermally insulated from each other. the ratio of the initial rate of cooling of S_1 to that of S_2 is (a)1/3 (b)1/(sqrt3) (c) (sqrt3)/1 (d) (1/3)^(1/3)

Two bodies of same shape, same size and same radiating power have emissivities 0.2 and 0.8. The ratio of their temperatures is

Two bodies of same shape, same size and same radiating power have emissivities 0.2 and 0.4 The ratio of their temperature is .

Two spherical bodies have radii R,2R and emissivities e,2e If the temperature ratio is 2:1 then the powers will be in the ratio .