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

  • View Poll Results: Are you resitting this unit?
    YES!
    45.30%
    NO!
    54.70%

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    (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...
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    (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
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    (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? =/
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    I would never have thought of that.. great im completely screwed.. yr like a physics genesis
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    (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?
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    (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!
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    Is anyone aware if AQA mark down for significant figures?
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    Hows revision going 4 physics unit 2..
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    (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..
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    (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
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    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?
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    (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....??
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    (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?:confused:
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    like yr method.. ive got a full week b4 physics so planning to wrk flat out.. do u's not have study leave...??
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    Well den u prob got da mrk
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    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
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    for the quality of a strangeness i put: "a strance particle has a non-zero value for strangeness"
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    surprised no ones put the paper up !
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    (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.
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    I said a strange particle contains a strange quark :/
 
 
 
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