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A copper ball 2 cm in radius is heated i...

A copper ball 2 cm in radius is heated in a furnace at `327^@C` If its emissivity is 0.3, at what rate does it radiate energy ?

A

1.72W

B

2.76W

C

11.0W

D

2.15W

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SL ARORA-Thermal Properties of Matter-Exercise
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  10. The unit of thermal conductivity is :

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  14. If the amount of heat energy received per unit area from the Sun is me...

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  16. If temperature of a black body increases from 7^(@)C to 287^(@)C , the...

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  17. A black body is heated from 27^(@)C to 127^(@)C. The ratio of their en...

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  18. The rate of dissipation of heat by a black body at temperature T is Q....

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  19. A copper ball 2 cm in radius is heated in a furnace at 327^@C If its e...

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  20. A black body, at a temperature of 227^@C, radiates heat at a rate of 2...

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