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

Ralphus J
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#681
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#681
I really dont think MRI procedure will come up as it was the BIG marker last year and the formation AND evolution of a star was febuarys.
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susan23
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#682
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#682
(Original post by jam.wa)
Surely more information needed?
nope thats all the qs is...cant do it
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jam.wa
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#683
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#683
You know the annoying green page in the textbook? It's the one on the uses for capacitors, it has 3 circuit diagrams and a huge chunk of text about each. Do we need to know the uses for capacitors in this much detail?
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muffingg
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#684
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#684
"Fermi pressure - Two electrons cannot exist in the same quantum state"

What does that mean?
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jam.wa
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#685
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#685
(Original post by Ralphus J)
I really dont think MRI procedure will come up as it was the BIG marker last year and the formation AND evolution of a star was febuarys.
MRI is an infinitely dense object.

Nothing can escape MRI, not even light.
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jam.wa
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#686
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#686
(Original post by muffingg)
"Fermi pressure - Two electrons cannot exist in the same quantum state"

What does that mean?
It means you're reading too deep into A level Physics.
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muffingg
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#687
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#687
(Original post by jam.wa)
It means you're reading too deep into A level Physics.
Is it not possible to explain this? I mean it doesn't make ANY sense at all to me. What does it mean they can't exist in the same state?
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susan23
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#688
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#688
(Original post by muffingg)
"Fermi pressure - Two electrons cannot exist in the same quantum state"

What does that mean?
wtf is that?
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ChoYunEL
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#689
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#689
(Original post by susan23)
wtf is that?
(Original post by muffingg)
"Fermi pressure - Two electrons cannot exist in the same quantum state"

What does that mean?

It's the Electron degeneracy pressure, the reason only two electrons can occupy any energy in an atom.
If the star tries to degrade/collapse further, a limit is reached when further collapse would require two or more electrons to exist in the same quantum state.
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muffingg
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#690
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(Original post by susan23)
wtf is that?
That's part of the stellar evolution. When a star of less than 3 solar masses becomes a white dwarf, it cannot collapse further because apparently the Fermi pressure doesn't allow two electrons to exist in the same quantum states.

For a star of more than 3 solar masses, the white dwarf however continues to collapse because apparently the gravitational pressure overcomes the Fermi pressure and it collapses to a neutron star or black hole.

Don't see the logic behind that.
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susan23
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#691
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#691
(Original post by ChoYunEL)
It's the Electron degeneracy pressure, the reason only two electrons can occupy any energy in an atom.
If the star tries to degrade/collapse further, a limit is reached when further collapse would require two or more electrons to exist in the same quantum state.
We dont need to knwo tha.
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ChoYunEL
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#692
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#692
(Original post by susan23)
We dont need to knwo tha.
You asked what it was
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Pandit Bandit
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#693
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#693
what is the problem with hubbles constant guys?
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susan23
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#694
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#694
(Original post by ChoYunEL)
You asked what it was
hahaa thanks chocho
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muffingg
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#695
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#695
(Original post by susan23)
We dont need to knwo tha.
Well, I've got two official OCR books for this unit and both of them quite clearly talk about this. I think a question about this could well come up.
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Rosieretops
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#696
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#696
(Original post by CoffeeStinks)
Do we need to know the temperature and dates of the evolution of the earth or just be able to describe what happens?
I would like to know this too. It's nearly impossible to remember, I think you would get most marks for getting it in the right order. They like it when you show a clear sequence of events.
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susan23
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#697
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#697
(Original post by Pandit Bandit)
what is the problem with hubbles constant guys?
I guess it's not accurate because we don't know the exact distances of many galaxies that are very far from earth, hence it's only an estimation. The hubbles constant will therefore effect the calculation of the age of the universe, as the gae = 1/H(hubblesC)
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susan23
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#698
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#698
(Original post by muffingg)
Well, I've got two official OCR books for this unit and both of them quite clearly talk about this. I think a question about this could well come up.
giv me the page its on.
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Rosieretops
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#699
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#699
(Original post by Pandit Bandit)
what is the problem with hubbles constant guys?
You need to know the distance from earth of the galaxy and that's pretty difficult to measure.
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ChoYunEL
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#700
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#700
(Original post by muffingg)
Well, I've got two official OCR books for this unit and both of them quite clearly talk about this. I think a question about this could well come up.
You'll get a nice mark if you mention Fermi Pressure. I doubt they would ask us to explain what Fermi Pressure is since it isn't actually in the spec.

If they do - you're one up on everyone! :P
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