7: Equations Flashcards
energy carried by a photon (discrete packet of em radiation)
E = hf = hc / lambda
E = energy (joules)
h = planck’s constant (6.63 * 10^-34 Js)
c = speed of light
Threshold frequency
f = Φ/h
where Φ = work function (J)
and h = Planck’s constant
What is Φ?
The work function of a metal - it is the amount of energy required to remove an electron from the surface of the metal
Maximum Kinetic Energy =
Ek = hf - Φ
Relationship between probability and resultant phasor
Prob. ∝ (Resultant phasor)²
equation with electronvolt, mass and velocity
eV = 1/2 mv²
ways to write energy carried by a photon
E = hf = hc/lambda = eV0
how to show change in energy between 2 energy levels
change in energy = E2 - E1 = hf = hc / lambda
equation to work out frequency of phasor rotation
f = E / h
de broglie equation
lambda = h / p = h / mv
how to work out frequency for the phasor for an electron
f = Ekinetic / h
Ekinetic = 1/2 mv²