Question

Checking of reradiating heat by atmospheric dust, $O_3$​, $CO_2$​ and water vapours is
A) Ozone layer effect
B) Radioactive effect
C) Greenhouse effect
D) Solar effect

Answer 1

Hint:Re-radiation defines as a second absorption of radiation. An example of re-radiation is global warming. Not all gas molecules are able to absorb IR radiation.

Complete answer
Checking of reradiating heat by atmospheric dust, $O_3$​, $CO_2$​ and water vapours is a greenhouse effect.

To understand this, we have to know about the greenhouse gases. Greenhouse gases and the greenhouse effect play an important role in regulating Earth's climate.

The greenhouse effect is that some of the energy that comes from the sun as light is absorbed by the Earth's atmosphere in the form of heat. Some greenhouse glass-like gases, including carbon dioxide $CO_2$, $O_2$, water vapor and methane ($CH_4$), are visible to most sunlight wavelengths, but are somewhat opaque to infrared or heat radiation. Thus on arrival, energy moves through the Earth's atmosphere, is converted to heat by surface and atmospheric absorption, and is not easily re-radiated into space. This leads to a rise in the temperature of the atmosphere which causes global warming as a consequence of an increase in the average temperature of the planet.

Note:The capacity to absorb and re-emit infrared energy is what allows $CO_2$ an effective greenhouse gas for heat-trapping. By hanging onto some of the Earth's thermal energy, greenhouse gases keep our world livable so that not everything escapes into space.