Q:

What may be said about the amount of energy in the form of infra-red electromagnetic waves that is radiated from our bodies?

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What may be said about the amount of energy in the form of infra-red electromagnetic waves that is radiated from our bodies?


  1. It depends on our body’s temperature.
  2. It would be greater if our layer of subcutaneous fat was thicker.
  3. It may be increased by contact between the body and an object with temperature lower than the body’s temperature
  4. It may be increased by exposing more bare skin.

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A: The amount of energy radiated as infra-red depends on the body temperature. (E ∝ T 4 )

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