Covers the various sections relating to Photons and Electrons, as well as the Photoelectric Effect.
Includes notes from the textbook, as well as additional class, video and research information, diagrams and practice questions.
Applicable to all IEB Grade 12s.
Written by a 95% < student.
Photoelectric effect - Revision introduction
Photon - ‘packet of energy’
Electrons fill energy levels from the bottom up.
If you give an electron the right amount of energy, in the form of a light, heat, sound, electric
photon, it will absorb the energy and jump to the next level.
Other electrons will give off photons and fall to the lower energy level.
Wavelength
(ƛ - lamda)
EM Spectrum
, The wave equation for EM radiation
c=λxf
𝑐
λ=
𝑓
𝑐
f=
𝜆
c - “The speed of light”
The speed of electromagnetic radiation in a vacuum.
A constant = 3 x 108
Unit: m.s-1
λ - Lambda, representing wavelength
Unit: m
Note: Be aware of conversions
f - Frequency
Unit: Hz (s-1)
Note: Be aware of conversions
f is inversely proportional to λ
kilo = x 103
mega = x 106
giga = x 109
tera = x 1012
milli = x 10-3
micro = x 10-6
nano = x 10-9
pico = x 10-12
Example:
What is the wavelength of a microwave with a frequancy of 2.45 GHz?
c=λxf
3 x 108 = λ x (2.45 x 109)
λ = 0.122 m
Example:
What is the frequency of a TV wave with a wavelength of 240 m?
c=λxf
3 x 108 = (240) x f
f = 1 250 000 Hz
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