Co Chapter 7 Light. High frequency → High energy Low energy → low frequency Fig. 7.3 Speed of...
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Transcript of Co Chapter 7 Light. High frequency → High energy Low energy → low frequency Fig. 7.3 Speed of...
High frequency → High energy
Low energy → low frequency
Fig. 7.3
Speed of light = 3.0 x 108 m/s
Electromagneticradiation
Fig. 7.4 Blackbody radiation
According to Max Planck,According to Max Planck,
the energy of vibrating the energy of vibrating
molecules exists only inmolecules exists only in
multiples of certainmultiples of certain
fixed amountsfixed amounts
Fig. 7.12 A mirror produces a virtual image
A virtual imagecannot be projected
onto a screen
A real imagecan be projected
Fig. 7.16 Formation of a mirage by bending of light
Our brains interpret the refracted light
as reflected light
Light travels faster in warmer air
Box Fig. 7.7 How a rainbow is formed
light is refracted
with blue being refracted
more than red is refracted
White
ROYGIBIV
Fig. 7.22 The photoelectric effect
Explanation by Einstein:
Light must strike metal
as small particles (quanta)
Light intensity has noeffect on the energy ofthe ejected electrons
Ephoton = hf
h = Planck’s constant
= 6.63 x 10-34 J
photons