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Definition
| A meson is a hadron that is composed of a quark and an antiquark. e.g. a pion or a kaon |
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Definition
A baryon is a hadron that is composed of thee quarks.
It has a baryon number of +1. e.g. proton or neutron |
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Definition
An anti-baryon is a hadron that is composed of three anti-quarks.
It has a baryon number of -1. e.g. anti-proton or anti-neutron |
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Definition
A lepton is a fundamental particle (cannot be broken down into anything simpler).
It has a lepton number of +1. e.g. electron, neutrino |
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Definition
An anti-lepton is a fundamental anti-particle (cannot be broken down into anything simpler).
It has a lepton number of -1. e.g. positron, anti-neutrino |
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Definition
The critical angle is the angle of incidence, at a dense to rare boundary, which produces an angle of refraction of 90o
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Definition
| An electron volt is the kinetic energy gained by an electron when it is accelerated across a potential difference of one volt. |
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Definition
The angle of incidence equals the angle of reflection.
The incident ray, the reflected ray and the normal at the point of incidence are all in the same plane. |
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Term
| The first law of refraction |
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Definition
| The incident ray, the refracted ray and the normal at the point of incidence are all in the same plane. |
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Term
| The second law of refraction or Snell’s Law |
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Definition
| For rays of any particular wavelength, at the boundary between any two given materials, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. |
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Term
| What is the wave equation? |
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Definition
c = f x lambda
where f = frequency (Hz);
c = speed of light (m/s);
lambda = wavelength (m)) |
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Term
| What is the deBroglie equation? |
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Definition
lambda dB = h/p
where:
h = Planck constant
p = momentum of the particle (= mv where m is the relativistic mass and v is the velocity)
lambda dB = deBroglie wavelength |
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| What is the Einstein electromagnetic wave equation? |
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Definition
E = hf = hc/lambda
where:
h = Planck constant
f = frequency (Hz)
c = speed of light (m/s)
lambda = wavelength (m) |
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| What is Einstein’s photoelectric effect equation? |
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Definition
hf = psi + ½ mv2
where:
hf = the energy of each incident photon (see above)
psi = the work function of the surface (the energy which binds each electron to the surface)
½ mv2= the maximum kinetic energy of an ejected electron (many interact on their way out and therefore have less energy than this!) – you MUST put the word maximum in!!! |
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