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Q.A copper sphere is suspended in an evacuated chamber maintained at a temperature of 300K.the sphere is maintained at a constant temperature of 500K by heating it electrically.A total of 210W of electric power is needed to do it.When the surface of the copper sphere is completely blackened,700W is neede to maintain the same temperatre of the sphere.Calculate emissivity of copper.


Q.A copper sphere is suspended in an evacuated chamber maintained at a temperature of 300K.the sphere is maintained at a constant temperature of 500K by heating it electrically.A total of 210W of electric power is needed to do it.When the surface of the copper sphere is completely blackened,700W is neede to maintain the same temperatre of the sphere.Calculate emissivity of copper.


Grade:upto college level

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