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# AQA Physics Unit 1 PHYA1 20th May 2013 watch

1. (Original post by medicus)
54/55 for an A or higher?

Yeah I was thinking around 55 for an A, what do you think it will be for a B because I was guessing around 50, so i'm hoping I may have got a B which would be epic seeing as I was on an E 3 months ago :/
2. (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 said that the W+ has mass but the photon does not
3. (Original post by g.k.galloway)
I put the boson had a charge Or is that wrong...aaahhh I don't know

Don't worry, I think they were after any of the following. I wrote about charge as well.

W boson has a non zero rest mass/Photon has a zero rest mass.
W boson is charged/Photon is uncharged.
W boson has a very short range (no more than 0.001fm)/Photon has infinite range.
W boson is the gauge boson for the weak force/ Photon is the gauge boson for the electromagnetic force.
4. That was probably the easiest paper I've done. And I got 30000 for that question btw
5. (Original post by cyfer)
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+?
I thought the Jan paper was easier so i would say its likely to be 68/70 again. (That could be because i think i got 68/69 but meh)
6. (Original post by Zakee)
Don't worry, I think they were after any of the following. I wrote about charge as well.

W boson has a non zero rest mass/Photon has a zero rest mass.
W boson is charged/Photon is uncharged.
W boson has a very short range (no more than 0.001fm)/Photon has infinite range.
W boson is the gauge boson for the weak force/ Photon is the gauge boson for the electromagnetic force.
Woo thanks
7. If it asked you for the resistance of the whole circuit then you must include internal resistance surely, as this contributes to total resistance
8. (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 wrote that w+ has a charge but photon doesn't. Seems right?
9. (Original post by Zakee)
Don't worry, I think they were after any of the following. I wrote about charge as well.

W boson has a non zero rest mass/Photon has a zero rest mass.
W boson is charged/Photon is uncharged.
W boson has a very short range (no more than 0.001fm)/Photon has infinite range.
W boson is the gauge boson for the weak force/ Photon is the gauge boson for the electromagnetic force.
Woo thanks
10. (Original post by EllBailz)
If it asked you for the resistance of the whole circuit then you must include internal resistance surely, as this contributes to total resistance

The wording of the question is strange. I interpreted to mean the total resistance of the circuit (the load resistance) so I missed out the internal resistance in my calculation. I did the parallel combination and left it out like that. I'm sure either way, it would only be a mark lost (as the question was worth 2 marks?)
11. that would be a 3 marker for total resistance- but this was one or 2 so you wouldnt work out parallel resistance (load) and then add on series (internal) for less than 3 marks
12. (Original post by EllBailz)
If it asked you for the resistance of the whole circuit then you must include internal resistance surely, as this contributes to total resistance
That's what I thought
13. (Original post by amar96)
I said that the W+ has mass but the photon does not
Photon does have a mass. Every particle has a mass.
14. (Original post by g.k.galloway)
That's what I thought

Did you get 1/R=1/4.22222222 + 1/2 +1/1.5
So R = 0.71?
15. for this syllabus, photons are said to be massless
16. no one predicted that 6 marker
17. 6 marker was a gift. Made a few stupid mistakes though
18. (Original post by StalkeR47)
Photon does have a mass. Every particle has a mass.

On the data sheet it clearly says it has no mass
19. (Original post by Zozzy)
Yeah I was thinking around 55 for an A, what do you think it will be for a B because I was guessing around 50, so i'm hoping I may have got a B which would be epic seeing as I was on an E 3 months ago :/
I hope it will be around 53-54 for an A...
20. (Original post by EllBailz)
Did you get 1/R=1/4.22222222 + 1/2 +1/1.5
So R = 0.71?
No as the internal resistance was effectively in series

so I did 1/R = 1/2 + 1/4.22222

find R

then +1.5

= 2.86 ish

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