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# A2 Physics Unit 5 ~ 18th June 2012 Tweet

Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.

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1. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by britchick)
There seems to be a mix of both the N and ln graphs on TSR... However I would expect the average person (non-TSR) to have drawn the N graph as this is what most students are familiar with. So even if the N graph is wrong, lots of people would have lost marks on it which will only help lower the grade boundaries, so don't worry too much if you did use N (I did too )
ahhhh....at last some words of relief...whewww!!!!
2. Re: A2 Physics Unit 5 ~ 18th June 2012
Does anyone know how you can get the A* in Physics? Do you need to average 90% across both modules and the coursework? or do you need to get a minimum of 90% in each module and coursework? or do you just need to average 90% in the modules? None of the teachers at my school know (it's a new course for our school) and various students I've asked have given me variations of what I've written above.
3. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by FDR)
Does anyone know how you can get the A* in Physics? Do you need to average 90% across both modules and the coursework? or do you need to get a minimum of 90% in each module and coursework? or do you just need to average 90% in the modules? None of the teachers at my school know (it's a new course for our school) and various students I've asked have given me variations of what I've written above.
I think this is right:
90% average across the A2 modules. So yes, it could be 90% across each of them. In more simple terms basically at the end of the day you need .9 x 300 UMS = 270 UMS at A2.
Last edited by britchick; 20-06-2012 at 18:16.
4. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by vampirerahim)
They gave ln value for a reason.....

There was a question in unit 2 i did last year regarding KE and PE
i managed to get the right answer
but when i checked the M.S it said it was wrong
even though my answer was right
coz i dnt use the formulas they wanted
I managed to have a chat (albeit a brief one) with my Physics teacher today, and he said that whatever you did regarding the graph would be correct, so long as you got a half life value around 80s. I drew a curve, simply because I thought it was easier to fit the values onto the graph.
5. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by britchick)
I think this is right:
90% average across the A2 modules. So yes, it could be 90% across each of them. In more simple terms basically at the end of the day you need .9 x 300 UMS = 270 UMS at A2.
Thanks, thats what I thought, but I wasn't sure.
6. Re: A2 Physics Unit 5 ~ 18th June 2012
in regards to the graphs, i reckon that there'd be a maximum of 6 marks for each methods... for the ln graph you have to calculate the gradient, which would be worth maybe one mark, but meanwhile taking the half life from an exponential decay graph would also be worth one mark... the other 5 marks could only come from drawing the graph and labelling the axis etc etc etc which is just as easy for either N or ln graph!
7. (Original post by Alexok)
Nah i still think its c, but its the fact that beta particles can travel several meters in air before being absorbed that makes them dangerous, because they have the potential to ionise our cells, so in that circumstance, having the beta particles in close proximity will be a danger
But if it couldn't penetrate skin, it would be irrelevant how far it could travel through air, it still wouldn't be harmful. If it couldn't travel through air but could still penetrate skin, it'd still be harmful. The fact it can travel through several metres of air is true, but not relevant to it being harmful.

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8. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by britchick)
I think this is right:
90% average across the A2 modules. So yes, it could be 90% across each of them. In more simple terms basically at the end of the day you need .9 x 300 UMS = 270 UMS at A2.
In the same vein, I know that the january exam was worth 120UMS, how is the remaining spread across the exam and practical?
9. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by A.J10)
In the same vein, I know that the january exam was worth 120UMS, how is the remaining spread across the exam and practical?
this exam's worth 120 too and the practical is worth 60!
10. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by A.J10)
In the same vein, I know that the january exam was worth 120UMS, how is the remaining spread across the exam and practical?
Yep, like the other person said:

Unit 1 - 120UMS
Unit 2 - 120UMS
Unit 3 - 60 UMS
Unit 4 - 120UMS
Unit 5 - 120UMS
Unit 6 - 60 UMS

Total = 600 UMS

11. Re: A2 Physics Unit 5 ~ 18th June 2012
How did you guys find the paper in comparison to the other papers?
What do you think the grade boundary for an A will be for this paper?
12. Re: A2 Physics Unit 5 ~ 18th June 2012
how is the ums calculated? and how to get an A?
13. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by Tommeo)
Hey everyone, after I compressing the file down, it still came to over 10Mb so I've had to do some screenshotting and republishing. But here it is:
The Paper:
June 2012 Paper Unit 5 Physics Edexcel
Credit to Elkana who sent me the paper earlier.
do you have the unit 4 paper? if so can u upload it?
14. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by elkana)
i think that the noise was evidence for a big bang which must mean that the universe was expanding

for the K.E question it said that net momentum was zero so the particles must have velocities directly opposite each other and to have the same momentum the ratio of their masses must be the same as the ratio of their speed and since the KE is the energy gained you can work out the KE gained and add the KE from the beggining and minus the KE of the helium

can anyone correct me (please dont)
do u have a copy of Edexcel Phys uNit 4 (June 2012) if so can u upload it?
15. Re: A2 Physics Unit 5 ~ 18th June 2012
Interesting point looking at markscheme: for popcorn/nuclear decay graph question, then using logs gets a max of 6 marks, but drawing without logs makes a maximum of 4 marks available.
16. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by fluteflute)
Interesting point looking at markscheme: for popcorn/nuclear decay graph question, then using logs gets a max of 6 marks, but drawing without logs makes a maximum of 4 marks available.
17. Re: A2 Physics Unit 5 ~ 18th June 2012
grade boundaries been announced by edexcel yet?
18. Re: A2 Physics Unit 5 ~ 18th June 2012
(Original post by l.a.s)
grade boundaries been announced by edexcel yet?
Wednesday.
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