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A polished metal plate with a rough blac...

A polished metal plate with a rough black spot on it is heated to about `1400K` and quickly taken into dark room Then .

A

the spot will appear brighter than the plate

B

the spot will appear darker than the plate

C

heat conduction is easier downward

D

it is easier and more convenient to do so

Text Solution

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The correct Answer is:
A
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
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  5. The velocity of heat radiation in vacuum is .

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  11. At a given temperature the ratio between emissive power and absorptive...

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  12. If the sun become twice hotter it will radiate .

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  15. A black body of temperature T is inside a chamber of temperature T(0) ...

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  16. The rate of cooling of a body is .

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  17. A cube a sphere and a circular plate made of same meterial and having ...

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  18. Newton's law of cooling is applied in laboratory for the determination...

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  19. Newton's law of cooling is a special case of .

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