Which of the following is a common source of EMF radiation?

• A. Microwave ovens
• B. Hair dryer
• C. Satellite communications
• D. Global Positioning Signals

Answer: (A)

Microwave ovens are a common source of EMF radiation because they deliberately generate microwave energy in the 2.45 GHz range to heat food. The oven is designed with shielding to keep most of that energy contained inside the metal cavity, but when it’s operating or if there’s a fault (like a damaged door seal), leaked microwave energy can escape. This makes them a recognizable everyday source of non-ionizing EMF exposure.

Other options aren’t as typical for EMF exposure in the same sense. Satellite communications and GPS involve RF transmitters, but their emissions are highly directional and usually weak by the time they reach most people, so they’re not encountered as a common household source. A hair dryer does produce electric and magnetic fields from the current, but it doesn’t emit high-power microwave radiation—the exposure is mainly from contact with heat and the nearby electric field, not a deliberate RF source like a microwave oven.