Question

why are microwaves, but not radio waves nor ultraviolet (uv) waves, used to heat up food?
electromagnetic waves carry energy in unique, fixed amounts called quanta (singular:
quantum). the amount of energy in one quantum depends upon the frequency of the wave.
matter, like water and fat molecules in food, absorb and emit specific quanta of energy. since
microwaves, radio waves, and uv waves have specific wavelengths and frequencies, they
interact differently with matter.
complete the sentences.
a ▼ has a higher frequency and carries more energy than a
▼. but the quanta of energy carried by a ▼ causes water and
fat molecules to vibrate and produce heat when absorbed. so ▼, rather
than ▼, are used to heat food.

Explanation:

Electromagnetic waves' energy (quantum) relates to frequency. UV has higher frequency (more energy) than microwaves. But microwaves' quanta match water/fat molecules' absorption (causing vibration/heat). Radio waves have lower energy (lower frequency) than microwaves and their quanta don't match for effective heating.

Answer:

A. Ultraviolet (UV) wave has a higher frequency and carries more energy than a microwave. But the quanta of energy carried by a microwave causes water and fat molecules to vibrate and produce heat when absorbed. So microwaves, rather than radio waves, are used to heat food.