Question

Please I need help with this question (see image).
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Answer 1

Question :

When an athlete perspires after running

1. Evaporation occurs and helps to cool the body.
2. Convection cools the body.
3. The body absorbs cold from the surrounding air.
4. Heat is conducted away from the body.

Answer :

When an athlete perspires after running evaporation occurs and helps to cool the body.

Correct option is A.

Explanation :

When an athlete perspires after running then sweat evaporates and we know that evaporation causes cooling as evaporation requires heat energy. The required heat energy is taken away by the molecules of sweat when they convert from liquid into gas, and this causes cooling on the surface of body. That's why it helps to cool the body.