Question

Give a detailed account of the laws of photochemistry ?

Answer 1

The Basic Laws of Photochemistry  

The First Law of Photochemistry

states that light must be absorbed for photochemistry to occur. This is a simple concept, but it is the basis for performing photochemical and photobiological experiments correctly. If light of a particular wavelength is not absorbed by a system, no photochemistry will occur, and no photobiological effects will be observed, no matter how long one irradiates with that wavelength of light.  

The Second Law of Photochemistry

states that for each photon of light absorbed by a chemical system, only one molecule is activated for a photochemical reaction. This law is true for ordinary light intensities, however, with high-powered lasers, two-photon reactions can occur, i.e., the molecule is raised to a higher energy state than produced by single-photon absorption.  

The Bunsen-Roscoe Law of Reciprocity

states that a photochemical effect is directly proportional to the total energy dose, irrespective of the time required to deliver the dose. This law is true for chemicals in a test tube, but the response of cells to radiation usually involves a sequence of interacting biological reactions, making a linear "dose x time" relationship highly unlikely. There is no reciprocity when damage is produced, e.g., DNA damage, but there can be reciprocity over a narrow range of doses for photoreceptors that trigger a response, such as phytochrome (see module on Basic Photomorphogenesis).  

 

Answer 2

Answer:

This is the laws of photochemistry.

Explanation:

As per the data given in the question we have to found the laws of photochemistry.

When light falls on any substance, only a fraction of it is absorbed whereas the rest is either reflected or transmitted. It is only the absorbed light which is effective in bringing about a chemical reaction.

• The First Law of Photochemistry states that only those radiations absorbed by a system can bring about a photochemical change. It means the chemical substance must absorb radiation so that photochemical reaction takes place. Otherwise, without absorbing the light radiation any photochemical reaction can’t take place. Therefore, this law indicates the importance of light radiation in photochemical reaction.

• The Second Law of Photochemistry states that for each photon of light absorbed by a chemical system, only one molecule is activated for a photochemical reaction.

Hence, this is the laws of photochemistry.

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