June 2011 G485-Fields, Particles and Frontiers of Physics Watch

Pheylan
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#581
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#581
(Original post by sulexk)
THE BIG QUESTION ON ELECTROMAGNETIC INDUCTION!

This is presumed to be a very challenging question- if you can do it, feel free to explain it to us!

That picture made me ill
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TobeTheHero
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#582
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OK here is what I will be revising in the next 12 hours:mad:

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
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purist66
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#583
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#583
Can anybody tell me how to convert Hubbles' constant (Ho) into the SI unit of seconds.
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MRHellen
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#584
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#584
can someone clearly define magnetic flux

like what are all the bits (mf) = BA Cosx
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TobeTheHero
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#585
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#585
Good Luck everyone!
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scotzbhoy
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#586
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#586
(Original post by Lengalicious)
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'
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.
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Lengalicious
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#587
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#587
(Original post by purist66)
Can anybody tell me how to convert Hubbles' constant (Ho) into the SI unit of seconds.
kms^-1/megaparsec so times whatever speed u got in kms^-1 by x10^3 and whatever the distance is by x10^22as parsec is x10^16 and Mega is x10^6
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Captain Hob
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#588
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#588
(Original post by purist66)
Can anybody tell me how to convert Hubbles' constant (Ho) into the SI unit of seconds.
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.
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Kalamari Dave
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#589
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#589
(Original post by TobeTheHero)
OK here is what I will be revising in the next 12 hours:mad:

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
Nice
My teacher also reckons there's gonna be a question on the life cycle of stars.

I'm starting revision!
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Pandit Bandit
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#590
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#590
state olber's paradox?
interpret Olbers’ paradox to explain why it
suggests that the model of an infinite, static
universe is incorrect?
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XST
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#591
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#591
(Original post by MRHellen)
can someone clearly define magnetic flux

like what are all the bits (mf) = BA Cosx
Magnetic Flux=Magentic Field Strength*Area that is perpendicular to the field,

or

Magnetic Flux=Magentic Field Strength*AreaCos(theta)
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Lengalicious
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#592
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#592
(Original post by scotzbhoy)
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.
yeh but this is going way too much into such a simple question, its a level physics. . . 2 point charges is simply gonna be semicircular field lines between the charges with weakest point in the centre and strongest point right next to the charge where the flux lines are closer together, if there was a question where there were two of the same charge or pole then yeh the field lines diverge but then there is no mid point as the field lines diverge away from the charge and dont connect. . .
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purist66
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#593
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#593
(Original post by Captain Hob)
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.
Thank you!
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Captain Hob
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#594
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#594
(Original post by Pandit Bandit)
state olber's paradox?
interpret Olbers’ paradox to explain why it
suggests that the model of an infinite, static
universe is incorrect?
Olber's paradox states that in a universe that's both static and infinite in size, the night sky should be bright - there should be a star in every direction you look, all giving roughly the same amount of light.

The fact that the night sky is dark suggests that our universe is neither static nor infinite.
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MRHellen
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#595
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#595
What is the cosmological principle?
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Lengalicious
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#596
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#596
(Original post by MRHellen)
What is the cosmological principle?
universe is both isotropic (same in all directions) and homogenous ( of uniform density)
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purist66
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#597
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#597
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.
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MarieLyon
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#598
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#598
i can't stand all those one mark questions. like why doesnt this happen, or what if this doubled what would be the affect on something else.
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susan23
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#599
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#599
(Original post by Lengalicious)
universe is both isotropic (same in all directions) and homogenous ( of uniform density)
what page is this stuff on in the OCR tesxtbook?
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MRHellen
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#600
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#600
(Original post by purist66)
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.
This exam is gunna arse **** me.

still A has been 60% not bad
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