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# PHYA1 - Physics Unit 1 Exam - 24th May 2011 watch

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1. (Original post by Smilie 101)
What did u guys get 4 da question about y a neutrino is used instead of an antineutrino... so confuzled...
Can't specifically remember that question, but I think it was something to do with the conservation of lepton numbers. I.e. A neutrino has a lepton number of +1 but an antineutrino has one of -1...
2. (Original post by swert)
hey what did everyone get for the specif charge question i was so baffled
You just had to do charge divided by mass.. i fink i got in and around 4.79x10-7 Ckg-1.. wbu
3. (Original post by maths134)
isa are marked harshly because of how people do. So 35/50 could be a D/best a C. So its likely to be around 42 ums, if u do get 80 ums and then 120 then its an A. But its looking unlikely because 80 ums seems optimistic for ur raw score.
why does it seem optimistic? =/
4. I would never have thought of that.. great im completely screwed.. yr like a physics genesis
5. (Original post by Tyrone-C)
I calculated my internal resistance to be 0.448 ohms I left my answer to 3 significant figures, do you think i could get full marks for this?
I did this, but by calculation, not using the gradient. I took emf as 1.52 from the graph. Then a value for V and I from the graph, did V/I to get R. Then used emf=IR+Ir, is this still full marks?
6. (Original post by Smilie 101)
I would never have thought of that.. great im completely screwed.. yr like a physics genesis
you would have done fine plenty of other marks to be picked up!
7. Is anyone aware if AQA mark down for significant figures?
8. Hows revision going 4 physics unit 2..
9. (Original post by Msd27)
you would have done fine plenty of other marks to be picked up!
Im glad some1 finks so.. idk now.. ill just have 2 wrk harder 4 nxt 1 jst in case..
10. (Original post by Smilie 101)
Hows revision going 4 physics unit 2..
I haven't touched it lol

Just planning on not seeing sunlight during half-term
11. Questions I can remember:
1. Proton , Neutron
2. The second equation can't happen -lepton number not conserved
3 X is a baryon as a to conserve baryon number
4. Specific charge was 4.79x10^7 Ckg-1
5. 6 marker on excitation of atoms
6. Ionisation is min energy required to remove electron from atom in a gaseous state
7. Internal resistance was 0.488ohms
8. Power was 0.355W
9. 5ohms was total resistance
10. Proof that resistors were 3
11. 1.33A
12. 2V
13 emf=1.52V
14. Neutrino needed to preserve lepton number
15. Electron capture

Any more?
12. (Original post by Notsocleverstudent)
Is anyone aware if AQA mark down for significant figures?
Well i no ma teacher always go's on about how he cant give us the marks cause we didnt give the answer to the correct num of sig fig.. so yea i fink they do....??
13. (Original post by Smilie 101)
Well i no ma teacher always go's on about how he cant give us the marks cause we didnt give the answer to the correct num of sig fig.. so yea i fink they do....??
It stated in the mark scheme that significant figures is tested once and is tested for a question where the data is given. So your answer has to be to the same significant figures to the data so if i didn't have the correct s.f for a question which data wasn't given then surely marks can't be dropped?
14. like yr method.. ive got a full week b4 physics so planning to wrk flat out.. do u's not have study leave...??
15. Well den u prob got da mrk
16. I thought I did pretty well until I came on here and saw all the correct answers

I got all of the maths right, it's just the damned explanation questions
17. for the quality of a strangeness i put: "a strance particle has a non-zero value for strangeness"
18. surprised no ones put the paper up !
19. (Original post by Alex J)
for the quality of a strangeness i put: "a strance particle has a non-zero value for strangeness"
wow my spelling was a fail in that sentence.. thank god i dont do english lol.
20. I said a strange particle contains a strange quark :/

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