Particles and Radiation Flashcards
How does a strong nuclear force graph look like?
0 to 0.5fm repulsion
0.5 to 3fm attraction
What happens to proton number for beta-minus decay
plus 1
What acts on strong nuclear and what exchange particle
acts on Hadrons and gluons
What is the equation for electron capture? and exchange particle?
p + e- —–> n + Ve
W+
What is the equation for beta-plus decay and exchange particle?
p —–> n + e+ + Ve
W+
What is the equation for beta-minus decay and exchange particle?
n —-> p + e- + Ve (anti)
W-
What are fundamental particles? Leptons or Hadrons
Leptons
What do muons decay into?
electrons
What is the stable baryon?
proton
Strange particles are produced by and decayed by
produced by strong nuclear
decayed by weak interaction
Kaon decay into? and what interaction?
pions via weak interactions
What is the strangeness of all pions
0
What is the strangeness of kaon 0
+1
What is the strangeness of kaon +
+1
What is the strangeness of kaon -
-1
kaons always have what quark
strange quark
Photon model of light suggested that? (EM, photon
*EM waves travel in photons where energy is directly proportional to frequency
*Each electron absorb a single photon (only emitted if above threshold frequency)
What is stopping potential?
Potential difference applied across metal to stop photoelectron with maximum energy
What is stopping potential?
Potential difference applied across metal to stop photoelectron with maximum energy
Describe the florescent coating?
- Voltage accelerates free electron which collide with mercury atoms causing them to ionise. Releasing more free electrons.
- Free electrons collide with mercury atoms causing them to excite and then de-excite to release UV photon.
- Fluorescent coating absorb photons make its electron to excite and de-excite and release photons of visible light.
What happens when the momentum increased? (de-Broglie and concentric rings)
wavelength decreases, amount of diffraction decreases so concentric rings become closer
How to calculate free electrons after collision ( energy levels )
E1 -E2. Difference to get the remaining
What is the difference between absorption and emission spectrum?
⭐ photons are energy carriers
⭐ In absorption, the electrons get excited to a higher energy level (by absorbing photons)
⭐ In emission, the electrons gets de-excite to a lower energy level (by emitting photons)
Why the distribution of kinetic energy proves the existence of antineutrinos
b particles have a range of kinetic energy
fixed amount of energy is released that shows that another particles carries energy differences
What happens to the excess energy when photon energy is greater than minimum energy?
converts to kinetic energy
State a property that defines hadron
experiences strong nuclear force
What is ionisation energy?
Minimum energy required to remove an electron from atom from ground state
differences between positron and electron antineutrino
⭐positron is charged whereas antineutrino is neutral
⭐ The antineutrino only interacts in weak whereas positron interacts electromagnetic
⭐ antineutrino has short range compared to positron
what is the quark structure of kaon 0
d s(anti)
does muon experience strong nuclear force
no
why does the frequency of radiation must be greater than certain value
energy of photon is proportional to frequency
there is minimum energy required to overcome the work function and emit photoelectrons
