Photoelectric effect Flashcards
What is always conserved in equations
Energy and momentum
Charge
Baryon number
Electron lepton number
Muon lepton number
When is strangeness conserved
only strong interactions
What is the photoelectric effect
photoelectrons are emitted from the surface of a metal after photons of certain frequency are shone on it.
What varies for different metals
frequency of photon required
(threshold freq)
What do EM waves travel in
discrete packets of energy and frequency (photons)
What does each electron absorb
single photon
What happens as you increase light intensity which is above threshold frequency
more photoelectrons per second
What is the work function
minimum energy required for electrons to be emitted from the surface of a metal
What is stopping potential
potential difference required across the metal to stop photoelectrons with max Kinetic energy
What is the equation for stopping potential
Ek(max) = eV
What is the photoelectric equation
E = hf = workfunction + Ek(max)
