PH-2149
Heat transfer
Physics · Secondary 4 · Hard · Heat transfer
Two identical metal containers of hot soup at 70 °C are placed in a room at 25 °C. Lid A is dull black, while Lid B is shiny silver. All other conditions are the same. After 15 minutes, which statement about heat transfer by radiation is correct?
- Container A loses more heat by radiation and its soup becomes cooler.
- Container B loses more heat by radiation because shiny silver is a better emitter.
- Both lids emit radiation equally, so both soups cool at the same rate.
- Neither container loses heat by radiation because the room is cooler.
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