4.5 quantum Flashcards
1
Q
threshold frequency
A
minimum frequency of the photons to release an electron from the surface of a metal
2
Q
work function
A
minimum energy required to remove a single electron from the metal surface
3
Q
photoelectric effect equation:
A
E = hf = Φ + ½ mv2max
4
Q
what is the photoelectric effect?
A
photoelectrond are emitted from the surface of a metal upon the absorption of EM radiation
5
Q
what is a photon
A
packet of energy
6
Q
de broglie wavelength:
A
λ = h/p
7
Q
what happens to the de broglie wavelegnth of an electron fired from an electron gun if the accelerating p.d is doubled?
A
eV = p²/2m and λ=h/p so doubling V increases p by a factor of √2 so decreases λ by factor √2
8
Q
graph of KEmax on the y-axis and f on the x-axis
A
y-intercept = Φ
gradient = h
9
Q
photon equation:
A
E = hf
