Quiz on Spectrofluorimeter and Luminescence

What is the origin of the term 'fluorescence'?

• A chemical compound

• A type of electromagnetic radiation

• A mineral called fluorspar

• A mineral called quartz

What phenomenon occurs when an electron returns to the ground state?

• Emission

• Reflection

• Absorption

• Refraction

Which type of luminescence occurs immediately after light absorption?

• Bioluminescence

• Fluorescence

• Chemiluminescence

• Phosphorescence

What is the main function of a spectrofluorimeter?

• To analyze fluorescence

• To measure pH levels

• To detect sound waves

• To measure temperature

Which of the following is a source of light used in spectrofluorimeters?

• LED

• Xenon Arc Lamp

• Incandescent Bulb

• Fluorescent Tube

What does Stokes' Law relate to in fluorescence?

• The concentration of the solution

• The temperature of the sample

• The intensity of light

• The wavelength of emitted light

Which of the following factors affects fluorescence intensity?

• Color of the sample

• Concentration of the substance

• Shape of the container

• Time of day

What is the role of excitation monochromators in a spectrofluorimeter?

• To emit visible light

• To isolate absorbed radiation

• To measure temperature

• To absorb UV radiation

Which type of fluorescence occurs with a delay after the incident light is cut off?

• Phosphorescence

• Fluorescence

• Chemiluminescence

• Bioluminescence

What is a disadvantage of using a spectrofluorimeter?

• High cost

• Not all compounds fluoresce

• Low precision

• High sensitivity