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What does Energy Equal?
E = cp = m[rest]c^2
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1 eV equals how many Joules?
1.6 x 10-19 Joules
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Mass of the electron in eV?
.511 MeV
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Mass of the proton in eV?
938 MeV, about 1 GeV
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What is Avogadro's number?
Na = 6 x 1023
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How much is one "u" atomic mass unit, it eV?
931 MeV/c2
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What does rest mass equal?
E/c2
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What is the charge of the electron in Coulombs?
1.6 x 10-19 C
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How do you calculate the binding Energy?
Coulombs force law
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What is momentum in terms of velocity?
p = γumru
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What is energy in terms of velocity?
p = γumrc2
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E' Lorentz transformation, with respect to v, velocity of observer is:
E' = γvE - γvΒvcp
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cp' Lorentz transformation, with respect to v, velocity of observer is:
cp' = - γvΒvE + γvcp
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What is the mass of a neutron?
approximately the mass of a proton, 1 GeV
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What is typical spacing between a nucleus and an election?
1 Angstrom
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What is the relationship between energy, mass and momentum?
E2 - (cp)2 = (mrc2)2
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What is beta2 in terms of gamma?
1 - 1/γ2
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What is the energy of a photon?
E = cp = hυ = hc/λ
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What is the power radiated by a moving charged particle? (Thanks Maxwell)
P = (2/3) (e2/c2) (a2)
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What is the value of h, planks constant in terms of "hc"
1240 eV Nm
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What is the energy in eV at a given wavelength λ of light?
E = hυ = hf = hc(f/c) = hc(1/λ)
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What is Intensity in terms of Energy per quanta?
I = hυ * number of photons per time per area
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How do you count the number of photons?
Intensity times area times time divided by hυ
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What is the photoelectric effect?
Shining uv light on one parallel plate causes current. Increase voltage to other side of plate and determine the stoping voltage.
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How do you measure KE in the photoelectric effect?
K = eVstopping
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What is the Compton wavelength?
hc/mec2
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What is change in wavelength due to Compton effect?
λc(1-cos x)
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How are X-rays produced?
accelerate electron into metal, it shoots off X-rays
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