Y1 Ch 04 Definitions Flashcards
Threshhold Frequency
The minimum frequency of light required to cause the photoelectric effect.
Intensity
Rate of energy transfer per unit area.
Photoelectron
An electron emitted during the photoelectric effect.
Threshold energy.
The minimum amount of energy required to cause the photoelectric effect.
Potential well
A model to help us understand why electrons require energy to rwmove them from a metal. An electron has its least potential energy in the potential well.
Work function
The least energy needed to release a photoelectron from a material. This equals the threshold energy.
Semiconductor
A matetial with conductivity between a metal and an insulator.
De Broglie wavelength
The planck constant divided by a particle’s momentum; it represents the wavelength of a moing particle.
Wave-particle duality
The idea that matter and radiation can be described best by sometimes using a wave model and sometimes using a particle model.
