CSIR (Council of Scientific & Industrial Research) Chemical Sciences: Questions 1 of 427

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» Physical Chemistry » Chemical Kinetics » Photochemical Reactions

Appeared in Year: 2014

MCQ▾

Question

Fluorescence lifetime of a molecule in a solution is Equation Sum of all non-radioactive rate constant for decay of excited state is 1.2 Equation . The fluorescence quantum yield of molecules is: - (June)

Choices

Choice (4) Response

a.

0.4

b.

0.2

c.

0.1

d.

0.6

Topic iScore

Ques. Time

Answer

d.

Explanation

  • Fluorescence: - Light absorbed by a substance may be emitted simultaneously (Radiative transition) emitting light. This is called fluorescence,

  • Quantum yield,

    Equation ________ (1)

    Equation ________ (2)

Image explaining Jobolanskii diagram

Image Explaining Jobolanskii Diagram

Showing the Image explaining of Jobolanskii diagram

Here, Equation

Equation

Equation )

= 0.6

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