June 2011 G485-Fields, Particles and Frontiers of Physics

Reply 460

Oh my Ms. Coffey

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 .. :dontknow:

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

Parsec is the distance of 1AU through a 1 arc second paralax.

Reply 461

M_I

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. :smile:

Reply 462

Oh my Ms. Coffey

Original post by M_I

Yep....to the 1st one atleast lol....leave a question when you reply. :smile:

Explain Compton Scattering and the Photoelectric effect.

Reply 463

Nirgilis

14

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. :h:

Reply 464

Oh my Ms. Coffey

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. :h:

Its a hard one to define, I could write it in equation form but not define it too well :flutter:

Reply 465

sulexk

OP

11

Here you go for the parsec

The long straight line:

That is the distance that gives a parallax angle of 1 arc second

Reply 466

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.

Reply 467

Acta Non Verba

7

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. :h:

Both definitions are equally valid.

Reply 468

Oh my Ms. Coffey

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.

Reply 469

Nirgilis

14

Original post by Acta Non Verba

Both definitions are equally valid.

But a parsec doesn't equal an AU... :s-smilie:

.. Or am I just being stupid?

Reply 470

trapzbrah

9

Original post by Kidms001

But a parsec doesn't equal an AU... :s-smilie:

.. Or am I just being stupid?

it doesn't

Reply 471

Acta Non Verba

7

Original post by Kidms001

But a parsec doesn't equal an AU... :s-smilie:

.. 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.

(edited 12 years ago)

Reply 472

scotzbhoy

Original post by Kidms001

I'd say that was good enough... :dontknow:

The glossary gives it as : The distance that gives a parallax angle of 1 arcsecond :yep:

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.

Reply 473

scotzbhoy

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.

Reply 474

trapzbrah

9

Jan 2011
Raw 100 65 57 50 43 36 0
UMS 150 120 105 90 75 60 0

Reply 475

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). :smile:

Reply 476

Tphys

1

Guess I should start revising now >_< Oh, how I hate medical physics...

Reply 477

Rothers

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). :smile:

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

Reply 478

johndory13

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). :smile:

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

Reply 479

MarieLyon

meh either way MRI and Ultrsound came up because I was just lookign at both mark schemes

June 2011 G485-Fields, Particles and Frontiers of Physics

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you