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 bodies have same mass and speed, then

Two electric lamps A and B radiate the same power. Their filaments have the same diemensions, and have emissivities. e_(A) and e_(B) . Their surface tempratures are T_(A) an T_(B) . The ratio T_(A)//T_(B) will be equal to

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 balls of same material and same surface finish have their diameters in the ratio 1:2. They are heated to the same temperature and are left in a room to cool by radiation, then the initial rate of loss of heat

Two wires made of same material have lengths in the ratio 1:2 and their volumes in the same ratio. The ratio of their resistances is