Question

how do microwave ovens use electromagnetic waves to cook food? (1 point)
○ the waves cause water molecules in food to vibrate and produce heat.
○ the waves transfer energy to the walls of the oven to heat the inner area
○ the waves strike the surface of food, increasing its temperature
○ the waves heat the air inside the oven enough to cook the food

Explanation:

To determine the correct answer, we analyze how microwave ovens work. Microwaves are a type of electromagnetic wave. Water molecules in food are polar (have a positive and negative end). Microwaves cause these water molecules to vibrate rapidly. This vibration generates heat due to molecular friction, which cooks the food.

• The option about transferring energy to the oven walls is incorrect because microwaves interact with food's water molecules, not primarily the walls.
• The option about striking the food's surface is incorrect as microwaves penetrate food (to an extent) and interact with internal water molecules, not just the surface.
• The option about heating the air is incorrect because microwaves don't heat the air significantly to cook food; they heat the food directly via molecular vibration.

So the correct option is the one stating the waves cause water molecules in food to vibrate and produce heat.

Answer:

The waves cause water molecules in food to vibrate and produce heat (the first option).