Questions and answers

What is chemical actinometry?

What is chemical actinometry?

Chemical actinometry involves measuring radiant flux via the yield from a chemical reaction. It requires a chemical with a known quantum yield and easily analyzed reaction products.

What is chemical actinometer briefly explain working of uranyl oxalate actinometer?

A typical actinometer is a liquid solution of oxalic acid containing uranyl sulfate. The experimentally determined relationship between the quantity of oxalic acid transformed and the quantity of light energy absorbed can then be used as a scale from which to predict either quantity when the other is known or measured.

How does an actinometer work?

The actinometer was invented by John Herschel in 1825. It works based on the principle that the rate of photolytic conversion of molecules within an actinometer cell is equal to the rate of absorption of photons in the actinometer.

Is also known as the principle of quantum activation?

Explanation: Stark-Einstein law is also known as the Principle of Quantum Activation. It states that in a primary photochemical process, only one molecule is activated for every photo of light absorbed by the chemical system.

Is solar radiation infrared?

Most of the solar radiation that reaches Earth is made up of visible and infrared light. Only a small amount of ultraviolet radiation reaches the surface.

What is photochemistry Slideshare?

III Swapnil jadhav (BMK) Introduction:- Photochemistry is the branch of chemistry which deals with the rate and mechanism of reaction taking place due to exposure of light (uv & visible). (2000-8000 A0 ). The reactions which can be brought about by light radiations are called photochemical reactions.

How important is the quantum mechanics in our daily life?

Communication has been made extremely easy because of the important role of Quantum Physics. Fibre optic telecommunication has made possible two-way and quick communication. The fibre optic telecommunication is possible only because of lasers, which are devices of Quantum Physics.

Which is the first step in systematic desensitization?

In the first step, relaxation techniques are learned and practiced. In the second step, the therapist and client work together to create an anxiety hierarchy that establishes a system for exposure. In the third step, the individual is gradually introduced to the stimulus that provokes their anxiety.

Can a systematic desensitization be used in in vivo Exposition?

The fact that the systematic desensitization technique can be applied in images means that many of the practical disadvantages involved in in vivo exposition with this type of phobia can be eliminated. One weakness of in vitro exposition is that it relies on the client’s ability to be able to imagine the fearful situation.

What’s the difference between flooding and systematic desensitization?

The main difference between these two approaches is the time requirement. Flooding happens at a faster pace, as it usually involves two- to three-hour treatment sessions in which a patient is faced with his or her phobia/stimulus. With SD, exposure to the stimulus typically happens over the course of several days, weeks or sometimes longer.

How does a desensitization hierarchy work for anxiety?

A desensitization hierarchy is constructed and the patient works their way through, visualising each anxiety provoking event while engaging in the relaxation response. The number of sessions required depends on the severity of the phobia.