Fichas
AS Physics
Fichas del conjunto (23)
- 1Describe the constituents of an atomProtons and neutrons make up a positive nucleus while the electrons are held in orbit by a strong nuclear force.
- 2What are the properties of the particles in an atomCharge - +/- 1.6x10-19
Mass - 1.67x10-27 (P/N) 9.11x10-31
Relative charge/mass - +1/-1 1kg or 0.0005 - 3what is an isotope notationA - nucleon No.
Z - Proton No. - 4what is an isotopeatoms with the same No. of protons but different No. of neutrons.
- 5what is specific chargecharge / mass
Q/M
C Kg-1 - 6explain the strong nuclear force (hint : range, strength and pair relations of particles)1. attractive stronger than electrostatic need to hold electrons. 2. range 3-4 fm. 3. strength to 0.5fm 4. works between p/p, n/n and p/n. 5. small separations snf must be repulsive
- 7what is Alpha emissionOccurs in Big nuclei eg uranium and radium. the nuclei is to big for the snf so an alpha particle is released,
aXz --- a-4Yz-2 + 4a2. - 8what is beta emissionemission of a electron and antineutrino.
0b-1 - 9what is the neutrino hypothesis1st only thought to be beta - 2nd energy levels less than before. Wolfgang Pauli suggested there must be another particle that was neutral and close to or had zero mass. eventually observed after 25 yrs
- 10What are photonsfrequency and wavelength linked by c - the speed of light. f = c/landa.
E=hf = hc/landa - 11What are the 3 types of Feynman diagrams.Electromagnetic repulsion, electron capture, beta emission.
- 12What are the types of particle classification.Hadrons and leptons - two types of hadrons, Baryons and mesons.
- 13what are baryons, mesons and leptons.B = protons and neutrons
M = pions and kaons
L = electrons, electron-neutrino, muon, muon-neutrino. - 14What is the quark structure of a proton.(antiproton).uud/anti uud
- 15What is the quark structure of a neutron. (neutron)anti u-dd
- 16What does the photon model suggest about light.when light hits the surface the metal is bombarded by photons.
If when one photon collides with free electrons the electron will gain hf = E
a threshold frequency has to be met to leave the surface of the metal. - 17what is the stopping potential.eVs = Ekmax (J)
- 18What is an electronvolt.The Ke carried by am electron after it has been accelerated through a pd of 1 volt.
- 19how do energy levels effect the change in energy.change in E = e2-e1 = hf = hc/landa.
- 20define the ionization of energy.Amount of energy needed to completely remove an electron from the atom from ground state.
- 21What is wave particle duality?the idea that light can be either a wave or particles.
- 22Example for wave properties of lightinterference and diffraction
- 23Example of particle properties of lightphoto electric effect - De Broglie equation landa = h/mv
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- A2 Physics Fichas sobre AS Physics, creado por jack moody el 17/12/2016.
- Creado por
- jack moody · dic 2016
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- 6 feb 2018
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