PHYSICS - Radiation - Excited Electrons & Fluorescence

The video tutorial explains fluorescence by exploring energy levels and atomic structure. It describes how electrons transition between energy levels, absorbing and emitting light. The concept of fluorescence is illustrated with examples like quinine in tonic water and fluorescent light bulbs. The video also discusses the dangers of UV light, which can cause ionization and harmful mutations in living tissue.

What happens when an electron absorbs energy equal to the energy gap between two levels?

• It leaves the atom completely.

• It moves to a higher energy level.

• It remains in the same energy level.

• It moves to a lower energy level.

What is the term used to describe the emission of light when an electron returns to its ground state in multiple steps?

• Reflection

• Ionization

• Fluorescence

• Absorption

Which part of the electromagnetic spectrum is involved in causing fluorescence in quinine?

• Microwave

• Ultraviolet

• Visible light

• Infrared

What is the result when electrons are promoted to such a high energy level that they leave the atom?

• Absorption

• Ionization

• Fluorescence

• Reflection

Why is UV light considered dangerous to living tissue?

• It is absorbed completely by the skin.

• It can create ions that alter cellular chemistry.

• It causes electrons to move to lower energy levels.

• It reflects off surfaces causing glare.