2.4 Flashcards
What is photoemission?
Photons of a sufficient energy can eject electrons from the surface of certain materials. This is called the photoelectric effect.
What does the photoelectric effect show about the nature of light?
evidence of the particle model of light
What is a photon?
A fundamental particle that carries electromagnetic force, or in simpler terms, a light particle.
How does the energy of a photon relate to its frequency?
The higher the energy of a photon, the higher the frequency.
Break down the equation E = hf
E = energy (J)
h = Planck’s constant (6.63x10^-34)
f = frequency (Hz)
What is threshold frequency?
The minimum frequency required to cause photoemission
What is the work function?
The minimum energy required to remove an electron from a material (photoemission)
Give an equation that shows the relationship between work function and threshold frequency
W = hf
o
W = work function (J)
h = Planck’s Constant (Js)
f = threshold frequency (Hz)
How do you calculate the kinetic energy of a photon?
Ek = E - W
Ek = kinetic energy (J)
E = energy of photon (J)
W = work function (J)
Given that the work function is related to threshold frequency, give another ways that this equation can be written
Ek = hf - h(fo)
Ek = kinetic energy (J)
h = Planck’s constant (Js)
f = frequency of photon (Hz)
fo = threshold frequency (Hz)