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MCQ on Fluorescence spectroscopy: Page-5

The energy of the emitted radiation in Stoke’s fluorescence is

(A) Greater than the excitation radiation

(B) Lower than the excitation radiation

(C) Equal to the excited radiation

(D) Sometimes greater and sometimes lower depending on the nature of the molecule

Eosin is more rigid than phenolphthalein. Which of the two substances doesn’t fluoresce

(A) Eosin

(B) Phenolphthalein

(C) It can’t be predicted

(D) Both fluoresce

Fluorescence quenching is caused by

(A) Paramagnetic ion

(B) Diamagnetic ion

(C) Both a and b

(D) None of the above

Most of the commercial spectrophotometers use

(A) Frontal geometry

(B) Right angled

(C) Straight through

(D) All of the above

Quantum yield of fluorescence is the ratio of intensities of

(A) Incident radiation to fluorescent radiation

(B) Fluorescent radiation to incident radiation

(C) Absorbed radiation to fluorescent radiation

(D) Fluorescent radiation to absorbed radiation