10 Questions
What happens when high voltage is applied across mercury vapor in a fluorescent tube?
Fast-moving free electrons collide with the mercury atoms.
Which process leads to the emission of visible light photons in a fluorescent tube?
Excitation of mercury electrons
What evidence supports the existence of discrete energy levels in atoms?
Line emission and absorption spectra
Which phenomenon states that all particles exhibit both wave and particle properties?
Wave-particle duality
In a fluorescent tube, what role does the phosphorus coating play?
Absorbing UV photons
What triggers the emission of UV photons in a fluorescent tube?
Excitation of mercury atoms by absorbed UV photons
Why do we observe lines at discrete points in line emission and absorption spectra?
Because electrons can only absorb an exact amount of energy
What property of waves do particles exhibit according to wave-particle duality?
Diffraction
How do line emission and absorption spectra relate to discrete energy levels in atoms?
They indicate where specific energy transitions take place in atoms.
What happens to the electrons in a fluorescent tube's phosphorus coating after absorbing UV photons?
They are excited and cascade down energy levels.
Test your knowledge on electromagnetic radiation and quantum phenomena with these flashcards based on AQA A-Level Physics 2.2. Explore key concepts such as the nature of electromagnetic waves and quantum phenomena.
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