Quiz on Photochemistry and Energy Transfer

The Jablonski diagram is used to explain:

• Acidity

• Viscosity

• Solubility

• Electronic transitions

In the Jablonski diagram, a transition from an excited singlet to triplet state is called:

• Fluorescence

• Phosphorescence

• Vibrational relaxation

• Intersystem crossing

Which is a non-radiative transition?

• Fluorescence

• Phosphorescence

• Emission

• Internal conversion

A radiative transition involves:

• Vibrational relaxation

• Internal conversion

• Intersystem crossing

• Emission of light

Which process happens very fast and leads to fluorescence?

• Triplet to singlet transition

• Internal conversion

• Phosphorescence

• Singlet to singlet transition

The Grotthuss–Draper law states that:

• All molecules absorb light equally

• Light is not required in reactions

• Emission happens before absorption

• Only absorbed light can cause a photochemical change

The Stark-Einstein law states that:

• All absorbed photons are scattered

• One photon destroys all molecules

• All light produces heat

• One photon activates one molecule in primary step

The number of molecules decomposed per quantum of light absorbed is called:

• Intensity

• Wavelength

• Lifetime

• Quantum yield

Quantum yield can be greater than one when:

• Light is not absorbed

• No reaction occurs

• Reaction is endothermic

• Chain reactions are involved

A quantum yield less than one indicates:

• High reactivity

• Excess emission

• Total conversion

• Losses by non-radiative pathways