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Working of a Thermos flask

A polished si...

Question

A polished silver surface is

A

good absorber of heat

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B

good reflector of heat

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C

poor reflector of heat

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D

none of these

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Solution

The correct option is B good reflector of heat
Heat rays are electromagnetic rays. Light rays are also electromagnetic rays. We know that a polished silver surface is a good reflector of light. this means that it is a good reflector of electromagnetic rays. Hence it is a good reflector of heat

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Working of a Thermos flask

Standard VII Physics

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