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PHYA5 ~ 20th June 2013 ~ A2 Physics

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Reply 1300
Avatar for sw121
sw121
Original post by amish123
I agree with your working out, I can't seem to get their answer.


thank youuuu it's a relief that someone else is getting the same answer :smile:
Reply 1301
Avatar for JacobG
JacobG
can anyone help me out with the bit of the spec that states - 'factors affecting the choice of materials for the moderator, the control rods and the coolant and examples of materials used'

only ever seen water used as coolant and moderator, and haven't see even seen what materials that control rods are made out of ?
thanks
Original post by posthumus
You won't be asked to derive it.... like I said you need to know its components.

& what assumptions have been made to form this ideal gas equation


I hope that you're right and that it doesn't come up, but (taken from the spec):

Molecular kinetic theory model
Explanation of relationships between p, V and T in terms of a simple molecular model.
Assumptions leading to and derivation of
pV = 1/3Nm(crms)2
Reply 1303
Avatar for Arihant
Arihant
Help!!!!!!!!!!

I have been entered for the wrong unit
i am suppose to do physics 5a astrophysics tomorrow

but my teacher has entered me for physics 5d turning points

what can i do?
anyone else praying for a 6 marker on balmer lines! soooo easy but they did it on june 2011 so i highly doubt it :frown: predicitions on the essay question? big bang? gases?
anyone help on core mod june 2012 qn 3bii plz i dont understand the eq they are using
Original post by Arihant
Help!!!!!!!!!!

I have been entered for the wrong unit
i am suppose to do physics 5a astrophysics tomorrow

but my teacher has entered me for physics 5d turning points

what can i do?


You can either revise the key concepts of turning points.
Or you have to talk to exam officer. They might have a spare paper and ask them to correct it. It might be possible to sort it out. Examiner could ask AQA about this being a mistake and it could be solved. Go early to school and talk to exam officer.
Original post by Arihant
Help!!!!!!!!!!

I have been entered for the wrong unit
i am suppose to do physics 5a astrophysics tomorrow

but my teacher has entered me for physics 5d turning points

what can i do?


That is awful :/

Just you or your whole class ? & why have you only found out now!

Go to school as early as you can and try and sort this out :smile:
Reply 1308
Avatar for angel2
angel2
Original post by Arihant
Help!!!!!!!!!!

I have been entered for the wrong unit
i am suppose to do physics 5a astrophysics tomorrow

but my teacher has entered me for physics 5d turning points

what can i do?


WOAW....I would turn up early and speak to an examiner about this maybe they could photocopy an astrophysics paper in time and let the exam board know... hope you get the right unit tomorrow
Original post by Dorkins
I hope that you're right and that it doesn't come up, but (taken from the spec):

Molecular kinetic theory model
Explanation of relationships between p, V and T in terms of a simple molecular model.
Assumptions leading to and derivation of
pV = 1/3Nm(crms)2


I guess it wouldn't be illegal for them not to tell us to derive it.

However along with my physics teacher think its completely unlikely. And too time consuming for what is just subbing in values constantly....

you need to understand assumptions such as elastic collision ... and so on. That is the important bit - that shows that the student has understanding to what the ideal gas law means
This paper, I am going to fail. I know no Astrophysics whatsoever, excuse me while I weep myself to sleep.
Original post by ibbyb94
anyone else praying for a 6 marker on balmer lines! soooo easy but they did it on june 2011 so i highly doubt it :frown: predicitions on the essay question? big bang? gases?


I'm thinking evidence for the big bang theory. What could you say for 6 marks?

Original post by Stephanie 950
I'm thinking evidence for the big bang theory. What could you say for 6 marks?


My teacher thinks its going to be Big Bang related too. Or stellar evolution
Reply 1313
Avatar for angel2
angel2
Original post by UnvesedSplash
anyone help on core mod june 2012 qn 3bii plz i dont understand the eq they are using


It's the count rate of the detector / (ratio detected * efficiency of the detector)
...one of the doggy application q's no formula to sub into :frown:
Original post by Xiomara
This paper, I am going to fail. I know no Astrophysics whatsoever, excuse me while I weep myself to sleep.


Feel the same... at least it's my last exam.

But will be miserable for some time for the start of summer if I completely screw this up!
Reply 1315
Avatar for kingm
kingm
10
Original post by Stephanie 950
I'm thinking evidence for the big bang theory. What could you say for 6 marks?



Original post by shannonphoebe



My teacher thinks its going to be Big Bang related too. Or stellar evolution


Anyone willing to give a quick summary on evidence for the HBB?? I haven't really looked at it :frown:
Original post by angel2
It's the count rate of the detector / (ratio detected * efficiency of the detector)
...one of the doggy application q's no formula to sub into :frown:


thanks youre a life saver :smile:
Original post by posthumus
Feel the same... at least it's my last exam.

But will be miserable for some time for the start of summer if I completely screw this up!


It's my last too :smile: You'll be fine though, you got 100UMS in Unit 4!
I'm just shocked at how I managed to neglect Astrophysics so thoroughly :L Done 2 past papers, scored two Bs...:frown:
Original post by Xiomara
It's my last too :smile: You'll be fine though, you got 100UMS in Unit 4!
I'm just shocked at how I managed to neglect Astrophysics so thoroughly :L Done 2 past papers, scored two Bs...:frown:


Done 3 past papers... well I just sat there copying out the mark scheme :tongue:

I was more prepared for unit 4 & I find unit 5 much harder n longer

Also I need 110 UMS to get an A, because of the frickin' ISAs :angry:

assuming the ISA gradeboundaries are unreasonable as always :mad:
What does coherent and monochromatic mean again?

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