Understanding Microwaves

What type of radiation is used by regular ovens to cook food?

• Gamma rays

• Ultraviolet radiation

• Infrared radiation

• Microwaves

How were microwaves discovered to be useful for cooking?

• By testing different wavelengths on food

• Through a planned experiment

• By observing the sun

• Accidentally, when a scientist's candy bar melted

What happens to water molecules when exposed to microwaves?

• They remain unchanged

• They evaporate instantly

• They vibrate, increasing temperature

• They freeze

Why doesn't the microwave oven itself get hot?

• It is made of heat-resistant materials

• Microwaves are reflected by the metallic sides

• It has a cooling system

• The food absorbs all the heat

What prevents microwaves from escaping through the glass window of the oven?

• A vacuum seal

• A thick layer of glass

• A metal mesh inside the glass

• A plastic coating