Lecture 14 – 10/12/10
Total luminosity is all the area under the curve
Atoms are mostly things concentrated in the center and spaced out
Neils Bohr’s results that only certain wavelengths are emitted or absorbed in different
energy levels is totally empirical
Quantum revolution
a)
Revolution was necessary
b)
Einstein introduced a critical insight and came up with the photo-electric effect which
would eventually become our TVs
Photo-electric effect
a)
When EM radiation hits a piece of metal:
i)
Negatively charged particles are emitted
ii)
They are ejected by the light
iii)
The particles are electrons
iv)
Number emitted is proportional to intensity
v)
Energy of electrons is independent of intensity
vi)
Only light about a certain frequency (threshold) will kick off electrons
vii)
Energy of electrons increases as the frequency is greater
Einstein- said light must act like a particle
a)
Einstein’s frequency condition- E=hf
i)
Energy is proportional to frequency
b)
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- Fall '07
- Harvey
- Space, Photon, Uncertainty Principle, Photo-electric effect, certain wavelengths
-
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