G485 June 2012 Paper and unofficial mark scheme

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I really really hope so :frown:

Also, what if you didn't divide by 1000 in the last Mpc question?...

(Sorry for asking so many questions but i'm so worried!)

That would only ever be one mark loss

Reply 101

lightray

How about the power question?
Was that 3x10^9/0.22
That one is 1 mark

This was posted from The Student Room's iPhone/iPad App

Reply 102

Hamer

For 4b, (I didn't put this in the paper but on reflection i think this is the answer):
physics problem answer.png

The gold nucleus won't have its field line deflected as much as it is a stronger field, whereas the alpha particle has a smaller charge to its line is deflected more. Still not 100% sure if this is right, but its the best guess i have.

Reply 103

teachercol

Posted all my answers and mark scheme in a separate thread.

Reply 104

momories

how did everybody find the paper? I thought it was harder than expected.

Reply 105

NikNaks

Not sure if this has been mentioned yet; apologies if it has. For 10)b), did anyone else consider F=ma and work out the acceleration? I did that and it was really tiny (10^-15), so I used that as my reasoning. Thoughts?

Reply 106

joefoxon

Original post by NikNaks

I did think of that, but I just stuck with the space expanding thing. I think it should get the marks though.

Reply 107

rgc610

For the very first question, for the area under graph would "Work Done" be okay?

Reply 108

Picture~Perfect

Original post by rgc610

For the very first question, for the area under graph would "Work Done" be okay?

That would only be true for a force against distance graph.

Reply 109

Picture~Perfect

Sorry this is taking so long, I will try and finish off the mark scheme this evening.

Reply 110

rgc610

Original post by Picture~Perfect

That would only be true for a force against distance graph.

If you look in the book it does mention, Work done against capacitor = Area under graph ??

Reply 111

Picture~Perfect

Original post by rgc610

If you look in the book it does mention, Work done against capacitor = Area under graph ??

Really? Which book?
Mine just says that the area under the graph is the energy stored by the capacitor. Can that be equated to the work done?

Reply 112

Joseppea

Original post by Picture~Perfect

Really? Which book?
Mine just says that the area under the graph is the energy stored by the capacitor. Can that be equated to the work done?

Energy = work done, they're interchangeable really, both measured in J. :smile:

Reply 113

cepti

Does anybody know what the answers to 4,5,6 were?
It's not written on the first page :smile:

Reply 114

Ultimate1992

In question 5, part C (iii) 1 - they said "The molar mass of plutonium-238 is 0.24kg" and it's supposed to be 0.24kgmol^-1, right? Will it count as a mistake made by OCR? Just like in the last June's paper they made some mistake. Would it affect the grade boundaries, what do you think? It looks insignificant, but still during the exam, when you r under high pressure, I think this could puzzle you

Reply 115

Uzzy~Sheikh

No but they stated the word "Molar Mass" so it is obvious that one mole of plutonium-238 is equal to 0.24kg. I don't think so that it will be a mistake, and grade boundaries is dependent on the students that well they have done in the paper. I hope grade boundaries are low because there was a lot pressure of time. I finished my exam on the dot!