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# Physics A G485. My answers and mark scheme 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: Physics A G485. My answers and mark scheme
As long as you show that you worked out d(Nphi)/dt ,and picked max value it will fine.
2. Re: Physics A G485. My answers and mark scheme
(Original post by teachercol)
As long as you show that you worked out d(Nphi)/dt ,and picked max value it will fine.
Need at least UMS 125/150 in G485
Do you know how many marks needed in this paper can get UMS 125marks?
Thanks!!!
3. Re: Physics A G485. My answers and mark scheme
Thank you for the mark scheme
I think I dropped 23 marks in this paper so that would give 77/100
Would that be an A?
4. Re: Physics A G485. My answers and mark scheme
For the question where it asks you to draw field lines, I think it said just to draw two lines, so I drew two horizontal straight lines going away from each centre outwards. Would this gain credit?
5. Re: Physics A G485. My answers and mark scheme
On 2d wouldn't you have to do 2 x 9.11 to the power of -31?
Because its a collision between a positron and an electron and they both have to same mass and are both converted into the gamma rays?
6. Re: Physics A G485. My answers and mark scheme
(Original post by Kaylea)
On 2d wouldn't you have to do 2 x 9.11 to the power of -31?
Because its a collision between a positron and an electron and they both have to same mass and are both converted into the gamma rays?
Each gamma ray photon takes half of the energy released, so theres no need to multiply by two, otherwise you would have to divide it by two again in later stages.
7. Re: Physics A G485. My answers and mark scheme
I think, worst case scenario (knocking a couple of marks off for each essay question) I'll have scored 85/100. Sweet.
8. Hopefully i will get more than 85%
thanks for the mark scheme

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9. Re: Physics A G485. My answers and mark scheme
Looks like I have around 80-84 marks
10. Re: Physics A G485. My answers and mark scheme
Looks like I have around 73, give or take a few marks.
Thank you for doing this, Teachercol! It is much appreciated.

Becca.
11. Re: Physics A G485. My answers and mark scheme
(Original post by jamesvernon)
So is the 90% Raw marks or 135 UMS?

I.E. Do i need to get 90/100 or 135/150 UMS to get an A* given that i got 90% in the first A2 module.

EDIT:

So i got 75/90 UMS in Newtonian World. = 83%

So i need 96% im UMS for This paper right? So 145 UMS? :s
grade boundaries change from year to year, UMS do not (they are a fair representation of how high into a grade you are)

what did you get in your coursework.

135UMS is nowhere near 90/100, the highest it's ever been for full UMS (150/150) was 88.
12. Re: Physics A G485. My answers and mark scheme
(Original post by teachercol)
7 a) Em radiation / photons / oscillating E and B fields / wavelength 1E-9 -> 1E-12. etc (2)
Col
I put 'Small wavelength' and 'high frequency' for 7a, what do you think ill of got for that? Dont see why I didnt just put electromagnetic radiation looking back! Wondered as they're very similar!

How certain are people that 88% (for jan12 anyway) was the 100% cut off? Without just guessing logically from the a,b,c,d,e boundaries?
13. Woo thank you very much!!

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14. Re: Physics A G485. My answers and mark scheme
(Original post by highway-61)
For the question where it asks you to draw field lines, I think it said just to draw two lines, so I drew two horizontal straight lines going away from each centre outwards. Would this gain credit?
You had to draw them from point A and from point B, so you wouldn't get anything,
15. Re: Physics A G485. My answers and mark scheme
according to the answers I've got like 85-90 so hopefully I'll catch up on my bad coursework scores
16. Re: Physics A G485. My answers and mark scheme
Looks like 69/100, which by the looks of things will be annoyingly close the the grade boundary for an A...
17. Re: Physics A G485. My answers and mark scheme
Thanks for this, it has put my mind to rest somewhat
I think I've got around 87 depending on the actual mark scheme and what they will allow
18. Re: Physics A G485. My answers and mark scheme
(Original post by Orrin)
How certain are people that 88% (for jan12 anyway) was the 100% cut off? Without just guessing logically from the a,b,c,d,e boundaries?
Its always twice the difference between A and B.
19. Re: Physics A G485. My answers and mark scheme
Turns out it wasn't too bad after frantically rushing to finish, I'm just hoping my writing was readable.
20. Re: Physics A G485. My answers and mark scheme
On the field line question (4b) are you sure they wouldnt want the alpha partilce's field to be reflected more than the uranium atom?

The uranium atom does have a much higher charge
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