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# AS Physics PHYA1 - 17/05/12 Tweet

Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.

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1. Re: AS Physics PHYA1 - 17/05/12
(Original post by Tullia)
You can get an A* in some exams. For example, those at GCSE. Technically speaking, of course.

They don't add up to 90%, but average at 90% UMS. And given you could theoretically get 100% UMS at A2, then you could get a C overall at AS and still get an overall A level at A*.

Good luck in attempting to get an A*.
Same to you dude
2. Re: AS Physics PHYA1 - 17/05/12
Would someone be able to briefly explain exchange particles to me? I'm not really sure what they are.. and the analogy with catching the ball and repelling and the boomerang?
3. Re: AS Physics PHYA1 - 17/05/12
(Original post by thescientist17)
Would someone be able to briefly explain exchange particles to me? I'm not really sure what they are.. and the analogy with catching the ball and repelling and the boomerang?
They essentially 'carry' a force between two particles during an interaction. They type of guage boson determines the type of interaction.

In the electromagnetic interaction the guage boson is a (virtual) photon. As the photon has zero mass the electromagnetic force technically has an infinite range - however the intensity decreases exponentially by the inverse square law.

In the weak interaction the guage bosons are the W+, W- (and Z) bosons. They are very heavy, around 100 times the mass of a proton iirc so the force has an extremely limited range. Note that on a Feynham diagram a W- boson moving the right is the same as a W+ boson moving to the left.

In the strong interaction the guage boson is the gluon, which is carried by pions. I don't think we need to know much about this however.

The analogy just explains how these particles carry momentum between particles and can lead to attraction or repulsion.
4. Re: AS Physics PHYA1 - 17/05/12
I really hate those really long questions where you have to describe a practical and it says 'your written communication will be assessed'...

...does anyone know if I would be able to get away with writing in bullet points only ?
And still get possibly full marks... like for 6 marks, 6 clear bullet points/steps.

Thanks in advance for any replies
5. Re: AS Physics PHYA1 - 17/05/12
(Original post by AmrinderRai)
I really hate those really long questions where you have to describe a practical and it says 'your written communication will be assessed'...

...does anyone know if I would be able to get away with writing in bullet points only ?
And still get possibly full marks... like for 6 marks, 6 clear bullet points/steps.

Thanks in advance for any replies
Totally agree! really puts me off! I asked my teacher same thing and he wasn't so keen! He said it would be best to try set them out in sentences even if they were quite simple and it is more fluid or something! But that is just he opinion he was quite vague so i'm going to try best to set out like he says :/
6. Re: AS Physics PHYA1 - 17/05/12
(Original post by laurenb11)
Totally agree! really puts me off! I asked my teacher same thing and he wasn't so keen! He said it would be best to try set them out in sentences even if they were quite simple and it is more fluid or something! But that is just he opinion he was quite vague so i'm going to try best to set out like he says :/
Well I found in one of the mark schemes, that my answer just needed to be clear and 'coherant'. So I think you can get away with it. And that was just for 1 mark.

The other 5 marks were just for each point being mentioned.

I think I'll stick to bullet points however, I go on too much about pointless stuff with sentences and get carried away and have no space left...
... & that costed me my A grade back in January
7. Re: AQA PHYA1~may 17th 2012~unit 1
How's everyone's revision going. Particle physics is easy as well as all the maths questions. Only the wordy questions for electricity and photons making me drop marks.
8. Re: AQA PHYA1~may 17th 2012~unit 1
Can anyone help?
Specific charge of 133 55 Cs?
ive done 55 x 1.6 x 10^-19 over 133 x 1.67 x 10^-27

The mark scheme says it should be over 137 x 10^-27
What have I missed out?
9. Re: AQA PHYA1~may 17th 2012~unit 1
Does anyone have a model/example answer for any one of those 6 mark experimental write up questions?
or if anyone knows where I can find one/some...I would greatly appreciate it
10. Re: AQA PHYA1~may 17th 2012~unit 1
(Original post by laurenb11)
Can anyone help?
Specific charge of 133 55 Cs?
ive done 55 x 1.6 x 10^-19 over 133 x 1.67 x 10^-27

The mark scheme says it should be over 137 x 10^-27
What have I missed out?
What do you mean by 133 55 Cs ?

All I know is you should do charge (C) over mass (Kg) to calculate the specific charge (C/Kg).
11. Re: AS Physics PHYA1 - 17/05/12
God only 3 days to go, I've a horrible feeling I'm getting a U in Physics :/
12. Re: AS Physics PHYA1 - 17/05/12
(Original post by HSRMJ)
God only 3 days to go, I've a horrible feeling I'm getting a U in Physics :/
And congratulations on spreading the negativity!
13. Re: AS Physics PHYA1 - 17/05/12
(Original post by kingm)
And congratulations on spreading the negativity!
Way to make them feel bad about themselves...wasn't really a necessary comment now, was it?
I'd understand how it was 'spreading negativity' if the comment was 'Wow we're all going to fail, so unprepared etc.' but it wasn't, so I don't see why you objected.
Last edited by Xiomara; 14-05-2012 at 17:07.
14. Re: AS Physics PHYA1 - 17/05/12
(Original post by kingm)
And congratulations on spreading the negativity!
You're very welcome!
15. Re: AQA PHYA1~may 17th 2012~unit 1
(Original post by SuperFantasticB)
What do you mean by 133 55 Cs ?

All I know is you should do charge (C) over mass (Kg) to calculate the specific charge (C/Kg).
not sure how to the notation on here but 133 is mass number and 55 is proton number. That why I dont understand where the mark scheme has got 137 from?!
16. Re: AQA PHYA1~may 17th 2012~unit 1
(Original post by AmrinderRai)
Does anyone have a model/example answer for any one of those 6 mark experimental write up questions?
or if anyone knows where I can find one/some...I would greatly appreciate it
all i can say is look through the past papers and pick the questions sorry :/
17. Re: AQA PHYA1~may 17th 2012~unit 1
(Original post by SuperFantasticB)
How's everyone's revision going. Particle physics is easy as well as all the maths questions. Only the wordy questions for electricity and photons making me drop marks.
feeling pretty confident tbh, what grade are you hoping for?

actually stupid question...its the TSR :L
18. Re: AS Physics PHYA1 - 17/05/12
(Original post by HSRMJ)
God only 3 days to go, I've a horrible feeling I'm getting a U in Physics :/
How? You could get at least a C from just rearranging the equations given to you..
19. Re: AS Physics PHYA1 - 17/05/12
Does anyone have a model/example answer for any one of those 6 mark experimental write up questions?
or if anyone knows where I can find one/some...I would greatly appreciate it
20. Re: AS Physics PHYA1 - 17/05/12
(Original post by AmrinderRai)
Does anyone have a model/example answer for any one of those 6 mark experimental write up questions?
or if anyone knows where I can find one/some...I would greatly appreciate it
You could look at the markscheme and memorize those bullet points..
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