4.5 Flashcards
what is a quanta
a small discrete unit of energy
what is a photon
a quanta associated with em radiation
elctronvolt
the ke gained by an electron when it is accelerated through one volt
eV to J
1 eV = 1.6x10^-19 J
work function
the minimum amount of energy needed to release an electron from the surface of a metal
threshold frequency
the lowest frequency of radiation that will result electrons being released from the surface of a metal
light as a wave
interference, dispersion, (diffraction)
light as a particle
detected in discrete packets, photoelectric effect
stopping potential
the pd needed to stop the fastest moving electrons released from the metal
rate of emission of photoelectrons
proportional to the intensity of em radiation incident upon the metal (note the intensity of the radiation of does not affect the energy of the photoelectrons)
how to measure the energy of photoelectrons
eVo=ke max (can sub this into the work function equation)
