Final answer:
The transfer of heat from electromagnetic waves like a fire or microwave oven is called radiation, which allows heat transfer through the emission and absorption of electromagnetic waves without the need for a medium. The correct answer is option c.
Step-by-step explanation:
The transfer of heat from invisible electromagnetic waves like a fire or microwave oven is called radiation. This type of heat transfer does not require a medium; it occurs through the emission and absorption of electromagnetic waves such as microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. For example, when you feel the warmth of the Sun or sense the heat from a fire without being in direct contact, it's the infrared radiation that your skin is detecting.
Whereas conduction is the transfer of heat through direct contact between objects and convection involves the movement of warm fluids or gases, radiation is unique as it can occur through the vacuum of space. Thus, option C, Radiation, is the correct answer to the question regarding the transfer of heat from a fire or microwave oven.