Unformatted text preview: graphs. What is the frequency of the
electromagnetic radiation from the xray source? c =λν
ν = c/λ ν = (3.00 x108 ms −1 ) / (100 x10 −10 m)
.
ν = (3.00 x1018 s −1 )
A note about units:
We should be familiar with the following:
Angstrom
nanometre
micrometre Å
nm
m 1 Å = 1 x 1010 m
1 nm = 1 x 109 m
1 m = 1x 106 m * 0.01 to 10 nm, corresponding to frequencies in the range 3 × 1016  1019 Hz.
10 5 05Sep13 Quantized energy and photons
Question: If light is a continuum of wavelengths, then how do we
explain the hydrogen emission spectrum which shows several
discrete (individual) lines???
Answer: Max Planck proposed that e.m. radiation comes in units of
defined energy, rather than in any arbitrary quantities.
quantum
Planck called the unit of light energy _________________ and
he showed that its energy is given by the equation: E=hλ
where h is Planck's constant = 6.63 x 1034 J s
This constant of proportionality relates the energy of a photon to its
frequency
All electromagnetic radiation is quantized and occurs in finite
"bundles" of energy (‘photons’). The quantization implies that a photon
of blue light of given frequency or wavelength will always have the
same size quantum of energy...
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