Question

Which are uses of electromagnetic waves? Check all that apply.

cooking foods
insulating buildings
using heat lamps
transmitting radio signals
using medical imaging
lighting rooms
cooling refrigerators

Answer 1

Applies:
- cooking foods — yes (microwave ovens use microwaves; infrared/grill methods also use EM radiation)
- using heat lamps — yes (infrared radiation)
- transmitting radio signals — yes (radio waves are electromagnetic)
- using medical imaging — yes (X‑rays, CT, PET, and MRI use electromagnetic radiation)
- lighting rooms — yes (visible light is electromagnetic)

Does not apply:
- insulating buildings — no (insulation blocks heat transfer, it’s not a use of EM waves)
- cooling refrigerators — no (refrigeration uses thermodynamic compression/heat‑exchange, not EM waves)