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19 July, 20:35

Three people are gathered around a campfire. One has his hands cupped around a ceramic mug of hot chocolate to warm them. Another is toasting a marshmallow above the fire. The third is roasting a hot dog above the glowing coals. Identify the primary source of heat transfer each person is

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  1. 19 July, 22:36
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    A process that involves transfer of heat from a hot substance to a cold substance by coming in contact with each other is known as conduction.

    For example, a person has his hands cupped around a ceramic mug of hot chocolate then heat is transferring from ceramic mug to the hands.

    Whereas a process in which heat energy is transferred in a wave-like motion through the space is known as radiation.

    For example, a person is toasting a marshmallow above the fire is getting heat energy in the form of radiation.

    Also, third person who is roasting a hot dog above the glowing coals is getting heat energy in the form of radiation.

    Hence, we can conclude that primary source of heat transfer for person 1 is conduction, and for both person 2 and 3 is radiation.
  2. 19 July, 23:35
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    Person one has conduction, person 2 has radiation, and person 3 has convention.

    Explanation:

    Person 1 is touching the mug to get warm, which is a transfer of heat.

    Person 2 is exposed to the fire, which is radiation.

    Person 3 is exposed to the warm air of convection.
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