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A-level Physics > Particles > Flashcards

Flashcards in Particles Deck (24):

What is the formula for specific charge?

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What is the charge and the mass of a proton neutron and electron?

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What are some examples of nuclear equations?

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How is beta decay different from alpha decay?

As alpha decay leaves even tracts, while beta decay leaves whispy tracts which is due to beta decay releasing an electron and an antineutrino from the nucleus

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How does the Strong Nuclear Force work?

At around 0.4fm. the strong nuclear force is the most repulsive to stop nucleons overlapping. At around 0.9fm. the force is at its most attractive to keep nucleons together. Just before 3.0fm., the strong nuclear force becomes ineffective and therefore regarded as a short range interaction.

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What is the elctrostatic force?

This is a force only between protons in the nucleus. The force is always repulsive at any distance as it never drops to zero.

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What is the formula for the speed of light?

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What is formula for the energy  of a photon?

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What is the formula for the power of a lazar?

P(js*-1)= Number of photons(s*-1) h(js) f(hertz)


What is annihilation and pair production?

Annihilation- This is where an antiparticle and a particle collide and produce two photos of equal energy and momentum

-charge,mass,enrgy and momentum

Pair production- This is where a high energy photons interact with a body(nucleus) as splits into a particle and its anti-particle


What are the similarities differences between particles and antiparticles?

- same mass and energy

- opposite charge


What is the conversion factor from Mev to joules?

1.6 times 10*-13


What is the rest mass energy of an electron?

0.510999 Mev


What is the general classifiction of particles?

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What are the characteristics of Leptons and what are some types of particles?



-does not interact with the SNF

- interacts with WNF and electrostatic force(if charged)

- elctrons, Muons, elctron neutrinos,muon neutrinos



What are the characteristics of Hadrons?

- heavy

-not fundemental

-made from quarks

interacr via SNF,WNF and elctorstatic force(if charged)


What are the two sub-groups in hadrons?


-structure of three quarksor anti- quarks

- particles include protons and neutrons

Mesons- structure of a quark and an antiquark

-pions and kiaons 


What are three types of quarks?

- an up quark

-a down quark

-a strange quark

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What is the structure to help identify the quark structure of Mesons?

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What are th conservation laws?

-used to check if interactions can occur

-all quantum values need to be conserved

Baryon number

Lepton number



How does strangness conservation work?

- strangness will be conserved where interactions with the SNF is important

- whe making baryons or mesons

-will not be conserved interactions of SNF is not important


What is the standard model?

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What are some unstable particles?

- free neutrons which decays in 885.7 seconds

- M- is also unstable


What are feyman diagrams

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