A tungsten lamp is at 3000 K and its surface area is 0.3 cm2. The emissivity found experimentally for tungsten lamp is 0.4. The rate at which heat is radiated from lamp is proportional to

 A tungsten lamp is at 3000 K and its surface area is 0.3 cm2. The emissivity found experimentally for tungsten lamp is 0.4. The rate at which heat is radiated from lamp is proportional to

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