Microwaves & Infrared

Does microwave or infrared radiation have longer wavelengths?

Microwaves have longer wavelengths than infrared waves

How do microwaves ovens work?

1. Microwaves absorbed by water molecules in food

2. Energy transfer to water molecules

3. Heat spreads throughout food

Can the microwaves used in satellite communication be absorbed by water molecules? (EXPLAIN)

No because if they were absorbed by water molecules, they wouldn’t be able to pass through the atmosphere

What is infrared radiation emitted from?

• All objects that have the1. rmal energy

• The hotter the object = the more infrared radiation being emitted

Give 3 uses of infrared radiation

1. In infrared camera to monitor temperature

2. To heat food in a toaster or grill

3. To heat a room via an electric radiator