These notes are provide detailed information on the optical properties and photons chapter in the Mind Action Series Physical Science Grade 12 textbook. These notes are colourful, have diagrams for further explanation and are very easily understood.
Chapter 9
{ electromagnetic waves } Threshold (CUT-OFF) frequency
*read page 105* (f0):
o minimum frequency of incident
Factors of EM waves: radiation at which electrons will be
emitted from a particular metal
1. Transverse o corresponds to a maximum
wavelength
2. Travel through vacuum WORK FUNCTION (Wo):
3. Travel @ 3 x 108 in vacuum o minimum amount of energy needed to
emit an electron from the surface of
4. Obey wave equation a metal
(c = f λ)
5. Carries energy in the form When E of photon > Wo of metal &
of photons Flight> Fo
➢ Photoelectrons = released
electromagnetic spectrum ➢ Energy of photoelectrons =
Ek (kinetic energy)
Photoelectrons = only release from
surface of a metal when Flight
surpasses the Fo of a metal
*if same metal = used, Wo = k*
Speed of light
➢ Look at F (Hz) & λ(m) in textbook C= fλ
{ photoelectric effect } F = frequency (Hz)
λ = wavelength (m)
C = speed of light in a vacuum
* read pg 106 * ➢ Constant = 3 x 108
Definition: Photon energy
o the process that occurs when Elight = transmitted as a photon
light shines on a metal and ➢ Each photon consists of = amount
electrons are ejected of energy called a quantum
o it establishes the quantum ∝
theory & it illustrates
particle nature of light E = hf
= nb bcz establishes quantum theory & E = hc/ λ
illustrates the particle nature of light E = energy of photon (J)
H = Planck’s constant
M = e/f
o 6.6 x 10-34
= H (planck) F = Frequency (Hz)
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