Infrared is radiant heat found at the lower energy end of the visible spectrum.

Infrared is radiant heat found at the lower energy end of the visible spectrum.

• A. Ionizing radiation
• B. Radiant heat found at the lower energy end of the visible spectrum.
• C. Gamma radiation
• D. Ultraviolet radiation

Answer: (B)

Infrared radiation is radiant heat emitted by objects in proportion to their temperature. It sits just beyond the red end of the visible spectrum, with wavelengths longer than visible light and photon energy lower than that of visible photons. Because its energy is too low to ionize atoms, infrared is a non-ionizing form of radiation and is mostly experienced as heat rather than light. The description that identifies infrared as radiant heat located at the lower-energy edge of the spectrum accurately captures its nature. The other terms point to higher-energy radiation (ionizing types like gamma rays or higher-energy ultraviolet), which is not infrared.

Infrared radiation is radiant heat emitted by objects in proportion to their temperature. It sits just beyond the red end of the visible spectrum, with wavelengths longer than visible light and photon energy lower than that of visible photons. Because its energy is too low to ionize atoms, infrared is a non-ionizing form of radiation and is mostly experienced as heat rather than light. The description that identifies infrared as radiant heat located at the lower-energy edge of the spectrum accurately captures its nature. The other terms point to higher-energy radiation (ionizing types like gamma rays or higher-energy ultraviolet), which is not infrared.