Question

Microwaves are a form of electromagnetic radiation. Microwave ovens are small household devices that use microwaves to heat and cook food. Which of the following most likely explains why having a microwave oven emitting microwaves is held to be a safe and common practice?

Responses
A Microwaves are relatively new inventions and do not have enough laboratory testing to demonstrate they are unsafe.Microwaves are relatively new inventions and do not have enough laboratory testing to demonstrate they are unsafe.
B Microwaves have a very high frequency causing them to be short lived and harmless.Microwaves have a very high frequency causing them to be short lived and harmless.
C Microwaves have much less energy than more damaging waves.Microwaves have much less energy than more damaging waves.
D The convenience of quickly heated food greatly outweighs the dangers of electromagnetic radiation.The convenience of quickly heated food greatly outweighs the dangers of electromagnetic radiation.

Answer 1

C

Microwaves are non‑ionizing electromagnetic radiation with much lower photon energy than ionizing waves (UV, X‑rays, gamma rays). They primarily heat materials by exciting molecular rotations (especially water) rather than breaking chemical bonds, and microwave ovens are designed with shielding and safety interlocks to limit exposure.