CSIR (Council of Scientific & Industrial Research) Chemical Sciences: Questions 1 of 862
Appeared in Year: 2014
Question MCQ▾
Fluorescence lifetime of a molecule in a solution is Sum of all non-radioactive rate constant for decay of excited state is 1.2 . The fluorescence quantum yield of molecules is:- (June)
Choices
Choice (4) | Response | |
---|---|---|
a. | 0.4 | |
b. | 0.6 | |
c. | 0.2 | |
d. | 0.1 |
Answer
b.
Explanation
- Fluorescence:- Light absorbed by a substance may be emitted simultaneously (Radiative transition) emitting light. This is called fluorescence,
- Quantum yield,
________ (1)
________ (2)
Here,
)
= 0.6
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