June 2011 G485-Fields, Particles and Frontiers of Physics

think of how ridiculous that sounds if its a neutral point then its not between two charges.... the field is weakest at the centre between 2 charges but if they are interacting there is always a field strength as the definition of charge is 'not neutral'

Can anybody tell me how to convert Hubbles' constant (Ho) into the SI unit of seconds.

Can anybody tell me how to convert Hubbles' constant (Ho) into the SI unit of seconds.

OK here is what I will be revising in the next 12 hours

THESE ARE MY PREDICTIONS You do not have to follow them

Module 1)

a) Describe the similarities and difference between E-field and G-field
b) Explain the use of deflection of charged particles in a mass spectrometer
c) Explain the effects of a uniform E-field on the motion of charged particles
d) Faraday's Law/Lenz's Law
e) Describe the function of a simple AC generator

Module 2

a) Uses of capacitors

Module 3

a) Alpha scattering experiment
b) Describe the properties of the strong nuclear force + Equilibrium Separation
c) Estimate the density of nuclear matter
d) Antiparticles
e) Define Binding energy
f) Describe Process of nucleur fission
g) Nucleur Reactor (Basic layout)

Module 4

a) Describe the nature of X-rays
b) Describe how x-rays are produced
c) Describe the Gamma Camera
d) Describe the use of medical tracers
e)PET
f) Describe the main components of an MRI scanner

Module 5

a) The Significance of Cosmic Background Microwave
b) Define AU + light years + state their values
c) State the Cosmological principles
d) Possible fate of the universe
e) THE BIG BANG (possible Long essay Marker)

CAUTION - these are ONLY predictions nothing more

can someone clearly define magnetic flux

like what are all the bits (mf) = BA Cosx

Not ridiculous at all. Neutral points are points where the fields cancel out. Imagine putting two south poles near each other and drawing the field lines; they will diverge as the fields overlap. In the middle, there are no lines, hence no field. Whether or not this is the midpoint depends entirely on the strength of the charges.

kms^-1 Mpc^-1 is 1000 ms^-1 1x10^6 pc.

One parsec is 3.1x10^16, so to get the answer in s^-1 you multiply by 1000/3.1x10^22.

Just think of how to cancel the units out, that makes it easier I find.

state olber's paradox?
interpret Olbers’ paradox to explain why it
suggests that the model of an infinite, static
universe is incorrect?

What is the cosmological principle?

universe is both isotropic (same in all directions) and homogenous ( of uniform density)

So how is everyone feeling about this exam then?

I'm pretty confident with most calculations. It's just the wordy medical physics stuff I don't like.

what page is this stuff on in the OCR tesxtbook?