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Ozone shields the surface of the Earth from which type of radiation coming from the Sun?
X rays
White light
Infra-red
Ultra violet
Ultra violet
Ozone (O3тАЛ) in the stratosphere acts as a protective shield that absorbs the majority of the Sun's harmful ultraviolet (UV) radiation. This process prevents high-energy photons from reaching the Earth's surface, where they could otherwise cause severe biological damage.
Ozone (O3тАЛ) in the stratosphere acts as a protective shield that absorbs the majority of the Sun's harmful ultraviolet (UV) radiation. This process prevents high-energy photons from reaching the Earth's surface, where they could otherwise cause severe biological damage.
Think of the ozone layer like a pair of high-quality sunglasses for the entire planet; just as sunglasses block harmful UV glare while letting visible light through, the ozone layer filters out the 'burn' while letting life-sustaining light pass.
O-U-V: Ozone blocks Ultra Violet.
O3тАЛ+h╬╜(UV)тЖТO2тАЛ+O тАФ Photodissociation of ozone by UV radiation
O+O2тАЛ+MтЖТO3тАЛ+M тАФ Reformation of ozone (where M is a third body to dissipate excess energy)
The ozone-oxygen cycle (Chapman cycle) describes how O3тАЛ is formed and destroyed. When a UV photon with a wavelength between 200тИТ310 nm strikes an ozone molecule, it provides enough energy to break the chemical bond, splitting the ozone into an oxygen molecule (O2тАЛ) and an oxygen atom (O). This endothermic process effectively converts dangerous UV energy into heat, preventing it from reaching the surface.
The ozone layer is primarily located in the stratosphere, at an altitude of approximately 15 to 30 km.
UV radiation is classified into UV-A, UV-B, and UV-C based on wavelength, with ozone being most effective at blocking UV-C and UV-B.
Chlorofluorocarbons (CFCs) are primary pollutants that lead to the depletion of the ozone layer.
Protects DNA from damage in living organisms
Prevents skin cancer and cataracts in humans
Maintains ecological balance by protecting sensitive phytoplankton
Stratospheric protection of biosphere
Monitoring of UV indices for health advisories
Ozone layer thickness is measured in Dobson Units (DU).
Option A (X-rays) are mostly absorbed by the upper atmosphere (thermosphere).
Option B (White light) refers to visible light, which passes through the atmosphere to support photosynthesis.
Option C (Infra-red) is partially absorbed by greenhouse gases like CO2тАЛ and water vapor, causing the greenhouse effect.
D is correct тАФ The ozone layer absorbs high-energy ultraviolet radiation, protecting the Earth's surface from its harmful effects.
Remember that while ozone in the stratosphere is 'good' (shielding UV), ground-level (tropospheric) ozone is a 'bad' pollutant and a major component of photochemical smog.
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