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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] Watch

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    (Original post by Protoxylic)
    Just the 0.12V mean emf is under debate atm. The rest of the paper went well.
    Nice! Did you halve the electrons in the MC?
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    that Hitler reacts video killed me
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    (Original post by StarvingAutist)
    e = -N dphi(t)/dt
    therefore Sa,b(e)dt = [Nphi(t)]a,b
    No negative because of sin and cos blah blah blah

    It should definitely be an integral; time is continuous.
    I just realised that the 2nd mark was for the unit, **** me. Why must I get confused over the number of marks rather than thinking through the physics. Oh well, that's the only question I fudged up, rest went good. And you?
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    (Original post by NEWT0N)
    Nice! Did you halve the electrons in the MC?
    Nope. The Q in Q=CV is the charge accumulated (or the magnitude) on one of the plates, not both.
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    (Original post by djw0bbl3)
    Please, someone reassure me that I'm not the only one who thinks that was awful? I'm really angry and upset It was just full of so many ****ty questions. I need some reassurance.
    I'm afraid the most one can say is that the grade boundaries MIGHT be lower because the written was harder than last year's (I thought last year's written was really standard with the capacitors 6 marker and all).

    But if e.g. you need an A for your offer and you dropped 45 marks there's no reassurance there really, just work harder next time
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    How many marks was the work done question, the electric field question, and the E.M.F question and what were the answers to these?
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    (Original post by Protoxylic)
    Nope. The Q in Q=CV is the charge accumulated (or the magnitude) on one of the plates, not both.
    I did that as well but people are saying you need to halve?
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    i actually clicked it -.-
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    On the multiple choice section, what was the right answer for the number of electrons? I didn't have Scooby Doo so I just guessed it.
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    I think the boundaries will be:
    A*=60
    A=55
    B=50
    C=45
    Dont quote me on results day
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    Are any of these accepted?
    (Somehow I completely forgot to cross it out properly and ended up scribbling it out -- in pen.)

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    (Original post by kevincarreira)
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    that Hitler reacts video killed me
    Is there one for this exam? Could you send me the link to it if so. Sorry if it's already on here I couldn't see it
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    (Original post by Protoxylic)
    I just realised that the 2nd mark was for the unit, **** me. Why must I get confused over the number of marks rather than thinking through the physics. Oh well, that's the only question I fudged up, rest went good. And you?
    Well at least you got the unit
    I think it went well; I might have lost a few marks on MC, 1a and the last question but otherwise I'm pretty confident.
    I'm not too sure about unit 5 though. We'll see. Good luck
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    (Original post by NEWT0N)
    Are any of these accepted?
    (Somehow I completely forgot to cross it out properly and ended up scribbling it out -- in pen.)

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    It clearly said at the front put a cross, are teacher said last year one student did what you did and lost 5 marks even though they wew all right. Maybe after a renark by human eye they could go up but i reckon by computer marking maybe not. Im sorry but we got told this on our last lesson just to make sure we didnt loose any silly marks
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    (Original post by danphil)
    Is there one for this exam? Could you send me the link to it if so. Sorry if it's already on here I couldn't see it
    https://www.youtube.com/watch?v=_l1XCc4xlws
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    (Original post by NEWT0N)
    I'm afraid the most one can say is that the grade boundaries MIGHT be lower because the written was harder than last year's (I thought last year's written was really standard with the capacitors 6 marker and all).

    But if e.g. you need an A for your offer and you dropped 45 marks there's no reassurance there really, just work harder next time
    Oh no no noo I haven't dropped 45 haha just didn't go too welll
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    (Original post by Sonnyjimisgod)
    I think the boundaries will be:
    A*=60
    A=55
    B=50
    C=45
    Dont quote me on results day
    I think 55 is too high. Granted, this year's MC was much easier than last year's, but again last year's written was really standard and this year's was slightly harder than usual (maybe that's just me?) and written is worth more than MC so if anything grade boundaries will be the same or less than last year, so <=53 for an A.
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    Thanks
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    (Original post by StarvingAutist)
    Well, what is wrong with my working? Nothing as far as I can see.
    Can you post the values provided in the question that you remember? Wanted to check workings, but calculator cleared itself.
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    (Original post by StarvingAutist)
    Well at least you got the unit
    I think it went well; I might have lost a few marks on MC, 1a and the last question but otherwise I'm pretty confident.
    I'm not too sure about unit 5 though. We'll see. Good luck
    I think I'm on for full marks with MC, with the only exception being the last Q on MC I said it was to increase mechanical stability. MC was fairly standard, 2-3 repeated Qs. Long answer was pretty good (bar the emf 2 marker oops). 1a was weird since you couldn't mention specific phase differences for forced vibrations as it is a range from 0 to pi/2 and pi/2 to pi (not inclusive of pi/2 as that is resonance). So I'm interested to see the mark distribution for that. Unit 5 is alright, I just hate turning points so we will see how that goes. Thanks, you too
 
 
 
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