Radiation

Radiation is any form of energy that radiates from a source. All matter emits electromagnetic radiation due to its thermal energy, typically in infrared or microwave bands. Very hot objects can emit visible light.

What does the term 'radiation' generally refer to?

• A type of sound wave

• Energy that spreads out from a source

• A form of chemical reaction

• A type of mechanical force

What kind of radiation do all objects emit due to their thermal energy?

• Acoustic radiation

• Nuclear radiation

• Electromagnetic radiation

• Ultraviolet radiation

In which bands is the radiation from thermal energy usually found?

• X-ray and gamma-ray bands

• Infrared and microwave bands

• Ultraviolet and visible bands

• Radio and sound bands

What happens to very hot objects in terms of radiation?

• They emit sound waves

• They glow at visible wavelengths

• They become invisible

• They stop emitting radiation

Which of the following is true about the radiation emitted by hot objects?

• It is not affected by temperature

• It is always in the ultraviolet range

• It can be visible to the human eye

• It is only detectable with special equipment