What is photochemical effect?

Definition. The result or consequence of a chemical reaction caused by light or ultraviolet radiation.

What is the meaning of photochemical pollution?

Photochemical air pollution is pollution caused by the reaction of unsaturated and saturated hydrocarbons, aromatics and aldehydes (emitted owing to the incomplete combustion of fuels) with light. It causes eye irritation.

What is photochemical act?

photochemical equivalence law, fundamental principle relating to chemical reactions induced by light, which states that for every quantum of radiation that is absorbed, one molecule of the substance reacts. As a result such reactions do not appear to obey the one quantum–one molecule reactant relationship.

What are photochemical reaction explain with examples?

A Photochemical reaction is a reaction which takes place when a chemical process absorbs light energy as its energy source. The example is photosynthesis. The photons from the light energy split water and enable ATP production that drives the entire process.

What is an example of a photochemical?

Examples of photochemical reactions Photosynthesis: plants use solar energy to convert carbon dioxide and water into glucose and oxygen. Human formation of vitamin D by exposure to sunlight. Bioluminescence: e.g. In fireflies, an enzyme in the abdomen catalyzes a reaction that produced light.

What do you mean by chemiluminescence?

Chemiluminescence is the emission of light from a chemical reaction. Typically, luminol or its derivatives act as a substrate, which undergo multiple oxidation reactions to form a product in the excited state, while returning to ground state emit light in the shorter wavelength (425 nm).

What are the effects of photochemical smog?

Ozone and nitric oxide (NO) can irritate the nose and throat and their high concentration causes a headache, chest pain, dryness of the throat, cough and difficulty in breathing. Photochemical smog leads to cracking of rubber and extensive damage to plant life.

What is gaseous pollutant?

The gaseous criteria air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from fossil fuels such as fuel oil, gasoline, and natural gas that are burned in power plants, automobiles, and other combustion sources.