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AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

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    will there be a range for capacitance i got 11 mf for some reason charge diff 35/3v

    what was the question after the first (1b)

    also final part of q1?
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    (Original post by C0balt)
    Idk I got 8.0 which is quite off too, so let's hope it's 8.2+-0.2. I took the end points of the line which weren't exactly on the grid intersection you know
    Yeah I did that first and then changed it right at the end...then somehow got 8.4. Hopefully there's a mark for something like 'reasonable attempt at calculating the gradient' so we would get 1 mark at least.
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    how many marks lost if I wrote neutirno instead of antineutrino fpr momentum question
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    (Original post by Nikhilm)
    Yeah I did that first and then changed it right at the end...then somehow got 8.4. Hopefully there's a mark for something like 'reasonable attempt at calculating the gradient' so we would get 1 mark at least.
    I initially got 8.22 but then changed to 8.0 because it gave me an exact value lmao
    Yeah we always get a mark for stating it's the gradient
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    (Original post by Tt5tttttt)
    how many marks lost if I wrote neutirno instead of antineutrino fpr momentum question
    Wasn't it one marker anyway?
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    (Original post by C0balt)
    I initially got 8.22 but then changed to 8.0 because it gave me an exact value lmao
    Yeah we always get a mark for stating it's the gradient
    Would you have to state that explicitly or would drawing a triangle on the graph and writing C = delta(Q)/delta(V), and then proceeding to do a gradient calculation, be enough for that mark?
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    (Original post by Nikhilm)
    Would you have to state that explicitly or would drawing a triangle on the graph and writing C = delta(Q)/delta(V), and then proceeding to do a gradient calculation, be enough for that mark?
    I think so
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    Can someone please tell me what value they used for calculation for gradient and energy store , I really forgot mine
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    I only remeber something like 96 and 74 these two figures in the question 1 section B
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    Can someone verify whether this is correct for question 3(b)(iii)?

    I put something about the beta minus particle being released at relativistic speeds so E_k = 1/2mv^2 can't be used...
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    Hey Guys,
    I feel like this exam went really well
    One thing though, on the very first question, I know that the gradient of the graph was the Capacitance but rather than doing (difference in Q)/(difference in V) I instead just took the value of Q/V for one point on the line, as it went straight through the point. Will this lose me marks? I still got 8.2 microfarads but didn't make it explicit that i knew it was the gradient.
    Also, for the 2nd part, rather than finding the area under the line I instead used E=0.5*C*V^2 and found the difference between them [ E(12)-E(9)=E ]
    once again; right answer but would i be docked a couple of method marks on the first question for not using the graph much?
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    (Original post by Questioner1234)
    Reckon 58/75 for an A*? Or too low?


    Posted from TSR Mobile
    That's not too low in my opinion. I think it will partially depend on how hard the Unit 5 paper is though, as when the A* boundary was adjusted to 61 in June 2014 then this was accompanied by Unit 5 having extremely low boundaries.
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    (Original post by C0balt)
    I initially got 8.22 but then changed to 8.0 because it gave me an exact value lmao
    Yeah we always get a mark for stating it's the gradient
    I didn't state it, but did the calculation for the gradient which I suppose explains that C=gradient


    Posted from TSR Mobile
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    (Original post by Tt5tttttt)
    how many marks lost if I wrote neutirno instead of antineutrino fpr momentum question
    Well, that whole question was worth a whopping one mark...they could allow other particles instead of the specific antineutrino, but something tells me a wrong particle will negate the mark, so worst case scenario you've lost one mark...
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    I'm so confused! For the energy stored (trapezium) question i did 1/2 CV^2- 1/2CV^2 but got an answer of 250J which is different to everyone else.. the values of V were 12 and 9 repsectively right?
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    (Original post by js.int)
    Can someone verify whether this is correct for question 3(b)(iii)?

    I put something about the beta minus particle being released at relativistic speeds so E_k = 1/2mv^2 can't be used...
    I think what they were pertaining towards is that the electron is released at a range of speeds (it's velocity isn't constant) since some of the momentum is also taken up by the antineutrino that is also released.
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    (Original post by Bob78)
    I'm so confused! For the energy stored (trapezium) question i did 1/2 CV^2- 1/2CV^2 but got an answer of 250J which is different to everyone else.. the values of V were 12 and 9 repsectively right?
    Remember: C was in microfarad...

    delta E is proportional to delta q and delta V, so you could just do your delta values...
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    How many marks was calculating the capacitance and the energy stored ? Are the grade boundaries likely to be as high as june 2013/14?
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    Doesnt anyone have a copy of the paper they could upload?
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    ok a few questions

    1, i put 11 microfarad for first part i clearly put gradient = q/v and triangle will i pick up marks
    2, the question after will there be ecf for it
    3, time constant i used ln0.8 how many marks lost
    4, could i talk about the mass in beta minus p question and link to kinetic equation

    thanks
 
 
 
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