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AQA Physics PHYA1 - 24 May 2016 - RESIT [Exam Discussion Thread] Watch

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    Did anyone get about 4010W for the firts part of the heater question ??
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    (Original post by kelvin1338)
    oh nevermind i realised my mistake aha
    Are we not both correct technically? If it was an a.c. with time base off it would look different surely?
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    (Original post by kelvin1338)
    I wrote pi^0 because strangeness doesnt balance with k^0....
    But strangenss has to be conserved, I'm not really sure but that's what I always thought
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    It's a dot only because time base is switched off. No current involved here
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    (Original post by Jonah1958)
    Did anyone get about 4010W for the firts part of the heater question ??
    2 sig figs bruh
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    (Original post by yasinmckay)
    I did
    Me too, as strangeness wasnt conserved as it was a decay so must have been pion
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    (Original post by kelvin1338)
    I wrote pi^0 because strangeness doesnt balance with k^0....
    What do you mean?
    K^1 (strangeness +1) ==> pi^1 (strangeness +0) + X (strangeness MUST be +1)

    The only particle with a strangeness of +1 and charge of 0 is K^0 so shouldn't X be K^0 ?

    I drew the diode symbol in the correct way at first but then crossed it out and replaced it with a resistor with an arrow on top. smh...
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    (Original post by Goldfly)
    What were the two reasons to have a low resistance? I got that one was to provide a high enough current for the oven to function but I was unsure about the other one.
    I wrote less heat wasted due to current and more current can flow.
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    (Original post by Goldfly)
    What were the two reasons to have a low resistance? I got that one was to provide a high enough current for the oven to function but I was unsure about the other one.
    less power is wasted as heat is what i put
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    I thought the paper was actually quite a good paper for me! I loved the particle section - the electricity section was slightly harder but I think I did alright in that section.

    (Original post by Shta15)
    Anyone get neutral pion for X
    Yes, that's what I got!

    Regarding the dot question I put that the oscilloscope was not in a closed circuit as S1 was open.
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    (Original post by CJWright97)
    K^0 i said
    That's what I got too but apparently it was a neutral pion. Tho I think the mark scheme might accept both
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    It was a dot because both the switches were open, so no current was flowing. The circuit was essentially incomplete.
    They wanted you to talk about it with reference to the lowest dot. As they said at the start of the question the switches were open.

    Also it was a neutral Kaon (Remember it was a Positive Kaon --> Positive Pion and X) - you had a strange particles on one side, therefore instantly one should be thinking of conservation of strangeness. Also with a neutral Kaon the charge, baryon number and lepton number were all also conserved.

    Hope that helps
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    (Original post by Anon-)
    less power is wasted as heat is what i put
    Power wasted is I sq R and low R means high I which is why I wasn't sure if that was correct
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    (Original post by CourtlyCanter)
    What do you mean?
    K^1 (strangeness +1) ==> pi^1 (strangeness +0) + X (strangeness MUST be +1)

    The only particle with a strangeness of +1 and charge of 0 is K^0 so shouldn't X be K^0 ?

    I drew the diode symbol in the correct way at first but then crossed it out and replaced it with a resistor with an arrow on top. smh...
    But isn't the interaction weak? So strangness wouldn't be conserved
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    (Original post by Goldfly)
    What were the two reasons to have a low resistance? I got that one was to provide a high enough current for the oven to function but I was unsure about the other one.
    I wrote less energy wasted as heat or less volts lost
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    (Original post by Goldfly)
    2 sig figs bruh
    I got 4400W
    :/
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    (Original post by Lazarus26)
    I got 4400W
    :/
    same
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    What did you tick when classifying particles.
    I ticked hadron and meson for the kaon
    And the others were a lepton
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    (Original post by Lazarus26)
    I got 4400W
    :/
    Sounds right to me. What about the next power one?
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    (Original post by Lazarus26)
    I got 4400W
    :/
    My mistake, i actually put down 4410, so ur right
 
 
 
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