Question

which of the following is an example of energy transfer by convection? a phone screen heats up when left in the sun. an egg fries in a pan on a heated stove. a cloud forms above a pool on a very hot day.

Explanation:

• Option A: Heating of phone screen in sun is radiation (electromagnetic waves transfer energy), not convection.
• Option B: Frying egg in pan is conduction (heat transfer through direct contact between pan and egg).
• Option C: On a hot day, water from pool evaporates (liquid to gas) due to heat. Warm, moist air rises (convection current) as it's less dense. As it rises, it cools, and water vapor condenses to form a cloud. This involves heat transfer by convection (movement of fluid - air - carrying heat).

Answer:

C. A cloud forms above a pool on a very hot day.