A scientist in Kenya investigates heat loss from buildings. She paints four identical metal cans with different surfaces and fills each with hot water at 80°C. She records the temperature after 10 minutes.

Which can will show the greatest temperature drop?

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Question

A scientist in Kenya investigates heat loss from buildings. She paints four identical metal cans with different surfaces and fills each with hot water at 80°C. She records the temperature after 10 minutes.

Which can will show the greatest temperature drop?

Accepted Answer

Can with black matt surface — Award 1 mark for identifying that a black matt surface is the best emitter of thermal radiation. A is incorrect — shiny silver surfaces are poor emitters and good reflectors. B is incorrect — white matt is a poorer emitter than black matt. D is incorrect — shiny surfaces reflect radiation and emit less than matt surfaces.

Answer

Can with white matt surface

Answer

Can with shiny silver surface

Answer

Can with shiny white surface

Answer

Can with black matt surface

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