Particles, Antiparticles & Photons 2.1.5 Flashcards
what is antimatter
Antimatter particles are identical to their matter counterpart but have an opposite charge
—>This means if a particle is positive, its antimatter particle is negative and vice versa
state the symbol for a proton
P
state the symbol for an antiproton
-
P
state the symbol for a neutron
n
state the symbol for an antineutron
-
n
state the symbol for an electron
e-
state the symbol for a positron
e+
state the symbol for a neutrino
Ve
state the symbol for an antineutrino
-
Ve
state the relative charge of a proton
+1
state the relative charge of an antiproton
-1
state the relative charge of a neutron
0
state the relative charge of an antineutron
0
state the relative charge of a electron
-1
state the relative charge of a positron
+1
state the relative charge of a neutrino
0
state the relative charge of an antineutrino
0
state the mass (kg) of a proton and antiproton
1.67 * 10^-27
state the mass (kg) of a neutron and an antineutron
1.67 * 10^-27
state the mass (kg) of an electron and a positron
9.11* 10^-31
state the mass (kg) of a neutrino and an antineutrino
0
what do corresponding matter and antimatter particle have
-opposite charges
-the same mass
-the same rest mass-energy
what is wavelength
the distance between the two adjacent crests of a wave (m)
what is frequency
the number of waves passing a point per second (Hz) or (S^-1)
what is the equation for wave speed.
state what each symbol means
wave speed (ms^-1) = frequency (Hz) * wavelength (m)
C = f * λ
C = speed of light in a vacume
f= frequency of EM radiation
λ = wavelength of EM radiation
what is a photon
wave-packets which are emitted a short bursts of waves
what equation links energy, frequency, and planks constant
state what each symbol means
E = hf
E= energy og photon (J)
f = frequency of radiation (Hz)
h = planks constant
what equation links energy, planks constant, speed of light and wavelength
state what each symbol means
E = hc / λ
E = energy of photon (J)
h = planks constant
c= speed of light in a vaccum
λ = wavelengh in Em spectrum
what is annihilation
When a particle meets its corresponding antiparticle they both are destroyed and their mass is converted into energy in the form of two gamma-ray photons
what are the two most common particle-antiparticle pairs that are seen
-Proton-antiproton annihilation
-Electron-positron annihilation
how many photons are produced in annihilation and how is energy conserved
2 photons are produced which travel in opposite directions to conserve momentum
annihilation equation
state the units
E min = hf min = E#
E min = minimum energy of one of the photons produced (J)
h = Planck’s Constant (J s)
f min = minimum frequency of one of the photons produced (Hz)
E = rest mass energy of one of the particles (J)
what is pair production
When a photon interacts with a nucleus or atom and the energy of the photon is used to create a particle–antiparticle pair
(you get equal amounts of matter and antimatter)
pair production equation
state the units
Emin = hfmin = 2E
Emin = minimum energy of the incident photon (J)
h = Planck’s Constant (J s)
fmin = minimum
frequency of the photon (Hz)
E = rest mass energy of one of the particles (J)
