Answer: infrared radiation
A solar cooker is a type of solar thermal collector. It “gathers” and traps the Sun's thermal (heat) energy. Heat is produced when high frequency light (visible and ultraviolet) is converted into low frequency infrared radiation.
Step-by-step explanation:
The solar radiation heats the construction paper through thermal energy. As the black paper heats up, it heats the surrounding air in the box through conduction. Through convection, the warm air circulates throughout the box and cannot escape through the box with the plastic film over the opening.
Solar cookers prevent pollution.
Burning fuels such as wood and gas pollutes the air and contributes to climate change. Solar cookers provide a pollution-‐free alternative.
Solar radiation contains a considerable amount of ultraviolet radiation, of which especially the short wavelength part below 315 nm is considered to be harmful to life on earth. The range between 280 and 315 nm is designated as UV-B radiation.