# June 2011 G485-Fields, Particles and Frontiers of PhysicsWatch

7 years ago
#461
http://www.thestudentroom.co.uk/show...ight=G485+2010

excellent resource! just wanted to let people know
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7 years ago
#462
(Original post by M_I)
Lets do this.....I wish the page refreshed itself.

What is electric field strength?
Force per unit positive charge measured in N C^-1.

(Original post by Kidms001)
http://www.stuff.co.nz/national/stuff-quizzes ..

Oh.. Physics based? Errm... Define the parsec.

Parsec is the distance of 1AU through a 1 arc second paralax.
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7 years ago
#463
(Original post by Oh my Ms. Coffey)
Force per unit positive charge measured in N C^-1.

Parsec is the distance of 1AU through a 1 arc second paralax.
Yep....to the 1st one atleast lol....leave a question when you reply.
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7 years ago
#464
(Original post by M_I)
Yep....to the 1st one atleast lol....leave a question when you reply.
Explain Compton Scattering and the Photoelectric effect.
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7 years ago
#465
(Original post by Oh my Ms. Coffey)
Parsec is the distance of 1AU through a 1 arc second paralax.
Not quite. A parsec is a distance within its own right. An AU is the average distance from the Earth to the Sun. A parsec is the distance given by a parallax angle of of 1 arcsecond.
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7 years ago
#466
(Original post by Kidms001)
Not quite. A parsec is a distance within its own right. An AU is the average distance from the Earth to the Sun. A parsec is the distance given by a parallax angle of of 1 arcsecond.
Its a hard one to define, I could write it in equation form but not define it too well
0
#467
Here you go for the parsec

The long straight line:

That is the distance that gives a parallax angle of 1 arc second
1
7 years ago
#468
Anyone know what the grade boundaries will be like on this paper? I can't find any online.
If it's the same as G482, about 60-65 for an A, then I should be fine. I'm a little worried otherwise.
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7 years ago
#469
(Original post by Kidms001)
Not quite. A parsec is a distance within its own right. An AU is the average distance from the Earth to the Sun. A parsec is the distance given by a parallax angle of of 1 arcsecond.
Both definitions are equally valid.
0
7 years ago
#470
(Original post by scotzbhoy)
Anyone know what the grade boundaries will be like on this paper? I can't find any online.
If it's the same as G482, about 60-65 for an A, then I should be fine. I'm a little worried otherwise.
Last summer was 66/100 for an A, Jan was 65/100 for an A.
0
7 years ago
#471
(Original post by Acta Non Verba)
Both definitions are equally valid.
But a parsec doesn't equal an AU... .. Or am I just being stupid?
0
7 years ago
#472
(Original post by Kidms001)
But a parsec doesn't equal an AU... .. Or am I just being stupid?
it doesn't
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7 years ago
#473
(Original post by Kidms001)
But a parsec doesn't equal an AU... .. Or am I just being stupid?
So another way of defining a parsec is saying that it is the distance whereby one astronomical unit subtends to an angle of one second of arc, which is essentially what Oh my Ms. Coffey said.
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7 years ago
#474
(Original post by Kidms001)
I'd say that was good enough...

The glossary gives it as : The distance that gives a parallax angle of 1 arcsecond
You should probably mention that the base of the triangle is 1 AU as well.
My definition is:
The length of the long leg of a right-angle triangle when the short leg is 1 AU and the angle between the sun and the earth, as seen from the object 1Pc away, is 1 arcsecond.
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7 years ago
#475
(Original post by Oh my Ms. Coffey)
Last summer was 66/100 for an A, Jan was 65/100 for an A.
Ok, thats no too bad. I need a B, so I'd say that would be about 60 marks (?), which is most definitely very doable.
0
7 years ago
#476
Jan 2011
Raw 100 65 57 50 43 36 0
UMS 150 120 105 90 75 60 0
0
7 years ago
#477
I think we are going to get a long question on x-rays or the gamma camera because Jan 2011 asked for MRI and Jun 2010 asked for ultrsound.

Can someone give me any information on PET and CAT (like the differences between them).
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7 years ago
#478
Guess I should start revising now >_< Oh, how I hate medical physics...
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7 years ago
#479
(Original post by MarieLyon)
I think we are going to get a long question on x-rays or the gamma camera because Jan 2011 asked for MRI and Jun 2010 asked for ultrsound.

Can someone give me any information on PET and CAT (like the differences between them).
No Feb didn't have anything on MRI, I think that'll come up tomorrow.

Actually, I think you got June 10 and Feb 11 mixed up
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7 years ago
#480
(Original post by MarieLyon)
I think we are going to get a long question on x-rays or the gamma camera because Jan 2011 asked for MRI and Jun 2010 asked for ultrsound.

Can someone give me any information on PET and CAT (like the differences between them).
You do not need the know the differences because they are completely different one uses X rays and the other gamma
And there are very few similarities

more likely to compare similar radiation
0
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