Unit 1 AQA Physics

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What is the charge for a Proton?
1.60x10^-19
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How do you calculate specific charge?
charge/mass
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What is an isotope?
Isotopes have the same proton number but different neautron number
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What formula do you use to calculate the energy of a photon?
E=hf or E=hc/wavelength
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What happens when a particle and an anti-particle collide?
Annihilation
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What happens during pair roduction?
a photon creates a particle and an anti-particle, and vanishes in the process.
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what is the minimum energy of a photon needed?
hf(min)=2E
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How can the exchange of a photon between two like particles be shown?
Two objects exchanging photon moving away from eachother.
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How can the exchange of a photn between two oppositly charged particles be shown?
Two objects exchanging photon moving away from eachother.
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Which is correct for a neutron-neutrino interaction?
n+v -> p+B-
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Which is correct for beta decay?
W- boson decays into a Beta- particle and antineutrino
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Which is correct for electron capture?
p+e- -> n+v
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Which is a correct list of conservation laws?
Energy and charge, Lepton number, Rest energy and strangeness.
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What is the other Fundamental group of particles? Baryons and...?
Mesons
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List the Leptons.
Electron, Muon, Tau and Neutrino.
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List the Baryons.
Proton and Neutron.
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List the mesons.
Pion and Kaon.
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What are hadrons?
Particles and antiparticles that can interact through the strong interaction.
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What are Leptons?
Particles that do not interact through the strong interaction.
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What happens when an Electron absorbs energy?
it moves to a shell at higher energy. Atom nw in Excited State.
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What happens during de-excitation?
atoms absorb energy but do not retain energy perminently.
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What can you do to identify the element produced by the light? (Energy levels and spectra)
measure the wavelength.
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How is a line of colour produced? (Line spectra)
When an electron de-excites.
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What is ionisation?
Electron gains sufficient energy to leave atom alltogether.
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Finish the sentence. Excitation will only occur if...
the photons energy is exactly equal to the difference in energy of the initial and final level.
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What happens to the gold leaf when electroscope is negativly or positivly charged? (photoelectric)
It rises and stays
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What is Einsteins theory of photoelectricity?
E=hf=hc/wavelength
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Formula for maximum kinetic energy of a photon?
E(max) = hf-0
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What is the equation for threshold freuency of a metal?
f(min) = 0/h
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How do you calculate the resistence of a metal?
pd across compnent / the current through it
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What is Ohms law?
The resistence of a metallic conductor under constant physical conditions is constant.
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How do you calculate Resistivity?
p=RA/L
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What is a superconductor?
A wire or device which has zero resistence.
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What is one of the current rules?
At any juntion in a circuit, the total current leaving the juntion is equal to the total cuttent entering the juntion.
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What is internal resistence?
Loss of pd per unit current in the source when current passes through it.
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What is a potential divider?
Two or more resitors in sereis with eachother. pd is divided between the components.
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Card 2

Front

How do you calculate specific charge?

Back

charge/mass

Card 3

Front

What is an isotope?

Back

Preview of the front of card 3

Card 4

Front

What formula do you use to calculate the energy of a photon?

Back

Preview of the front of card 4

Card 5

Front

What happens when a particle and an anti-particle collide?

Back

Preview of the front of card 5
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