A student investigates heat loss from a hot object using the apparatus shown. Two identical cans are filled with hot water at 80°C. Can X has a matt black surface and can Y has a shiny silver surface. Temperature sensors record the water temperature every minute.

After 20 minutes, the temperature in can X is 45°C and in can Y is 55°C.

What can be correctly concluded from these results?

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Question

A student investigates heat loss from a hot object using the apparatus shown. Two identical cans are filled with hot water at 80°C. Can X has a matt black surface and can Y has a shiny silver surface. Temperature sensors record the water temperature every minute.

After 20 minutes, the temperature in can X is 45°C and in can Y is 55°C.

What can be correctly concluded from these results?

Accepted Answer

The matt black surface emits infrared radiation at a greater rate than the shiny surface — Award 1 mark for identifying that matt black surfaces are better emitters of infrared radiation, causing faster heat loss from can X. A is incorrect — the shiny surface does not significantly reflect radiation from inside the can. C is incorrect — both cans have the same metal walls so conduction would be similar. D is incorrect — the cans are identical so have the same thermal capacity.

Answer

The shiny surface reflects infrared radiation back into can Y

Answer

The thermal capacity of can Y is greater than can X

Answer

The matt black surface emits infrared radiation at a greater rate than the shiny surface

Answer

Can X lost heat mainly by conduction through the metal walls

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