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# AQA Physics Unit 1 PHYA1 20th May 2013 Watch

1. (Original post by Seth James)
I got that as well, did you do V/I=R then add 5000 to it and then do 90000-Ans
It's 30000 (5000/10000+X)*6=0.75
2. I actually really liked this paper in the end but then again everybody seemed to, so I'm guessing the grade boundaries will probably be high. Do you think it will be around 50 for a B and 55 for an A?
3. (Original post by Mr.Suhk)
You dont add internal resistance- it said what is the total resistance of the circuit; this refers to the resistors not the battery itself so it is irrelevant
I added the internal resistance, surely the battery is part of the circuit?
4. (Original post by GeneralOJB)

My problem was that I thought the resistance of the circuit meant the 'load resistance', not the 'internal resistance' of the battery'.

My bad, I guess I'd achieve one mark for showing that I worked out the resistance of the parallel combination?
5. How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

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6. (Original post by g.k.galloway)
I added the internal resistance, surely the battery is part of the circuit?
Fair point... but typically you don't I thought it was a trick question anyway...

The battery supplies a certain amount of voltage to the circuit, so internal resistance already taken into consideration.

I'm not sure though... but that's how I thought of it
7. No i agree with you, the internal resistance should be irrelevant
8. (Original post by g.k.galloway)
I added the internal resistance, surely the battery is part of the circuit?
I added the internal resistance too

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9. (Original post by x-Sophie-x)
How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

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I wrote the exact same thing
10. (Original post by g.k.galloway)
I added the internal resistance, surely the battery is part of the circuit?
Yeah, so did I. If you don't include the internal resistance when calculating total resistance, it's the first I've heard of it.
11. Is the paper out of 70 or 72 btw?

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54/55 for an A or higher?
13. (Original post by x-Sophie-x)
How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

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w+ is charged/ it has rest mass
14. (Original post by x-Sophie-x)
How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

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Photon = infinite range, w = limited range but what you said is right too
15. (Original post by x-Sophie-x)
How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

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This was actually quite simple. I just said the W boson has mass but the photon doesn't. Alternatively you could have said the W boson is charged but the photon is not charged.
16. (Original post by x-Sophie-x)
How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea

Posted from TSR Mobile
I put the boson had a charge Or is that wrong...aaahhh I don't know
17. Found the paper really easy so I'm guessing grade boundaries will be really high unfortunately.

Do you think 70 marks will be 120 UMS or will it be lower nonetheless, like 66+?
18. I didn't include the internal resistance, as I thought the resistance of the circuit meant the load resistance (i.e, the resistance of the external components).
19. (Original post by g.k.galloway)
I put the boson had a charge Or is that wrong...aaahhh I don't know
Yeah boson has charge, mass and short range (photon has infinite range)
20. (Original post by x-Sophie-x)
Is the paper out of 70 or 72 btw?

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The paper is out of 70.

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