Photons And Electrons Flashcards
What is constant in a vacuum?
The speed of light (3 x 10^8 m.s^-1)
What is the relationship between the energy of a photon and the frequency of light?
Direct proportionality.
What are electron-volts?
Energy units.
What is the conversion between electron-volts and joules? Provide a formula.
1 eV = 1,6 x 10^-19 J
What is the photoelectric effect described as?
The process that occurs when light shines on a metal and electrons are ejected.
What are photoelectrons?
Electrons that are ejected from a metal by incident light.
What is the significance of the photoelectric effect?
- It establishes the quantum theory.
- It illustrates the particle nature of light.
Threshold (cut-off) frequency (Fo)
The minimum frequency of incident radiation at which electrons will be emitted from a particular metal.
Work Function (Wo)
The minimum amount of energy needed to emit an electron from the surface of a metal.
What is material specific in the photoelectric effect?
Work function.
What corresponds to a maximum wavelength in the photoelectric effect?
The threshold frequency.
