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# AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] watch

1. I really struggle to draw a refracting telescope at normal adjustment my lenses always end up huge on the page!!!! Any tips on what order to draw it in??
2. (Original post by simpletech668)
Just found a question on a past paper asking to use the answer from the question above (find Hubble constant) to estimate the age of the Universe??? How?? Pretty sure I haven't been taught this at all!
V=Hd so H=v/d which is just speed over distance, which equals 1/t, so to find t (the age of the universe) it is just 1/H. But remember to convert the units from km/s/Mpc to seconds, you'll know if you're right if you get an answer about 13/14 billion years.

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3. (Original post by betbi3etwerrd)
Someone give me a breakdown on how I should give S.F in questions which they have not asked for appropriate number of S.F
2 or 3. If it doesn't say appropriate number they can't dock marks for you making it longer than this, but to 1 sf might round it so much it's no longer the correct answer really and longer wastes time writing it down. They have said (somewhere, I was reading the spec or an examiners report or something like that) that 2 or 3 sf will always be acceptable. Although if you get one of those questions "show that such and such = this" then you might have to round further to get their answer because sometimes those are only to 1sf.
4. (Original post by Disney0702)
I believe we will be getting the R paper because I just heard that the AQA Biology students got an R paper
We will most certainly be getting the replacement paper
5. (Original post by Sbarron)
I really struggle to draw a refracting telescope at normal adjustment my lenses always end up huge on the page!!!! Any tips on what order to draw it in??

Grrr it's really annoying me... Now the magnifying lense is bigger than the objective lens!!!!! Help please
6. (Original post by Aman.1)
I believe you have to convert hubbles constant into it's SI units and then do 1/hubbles constant... not too sure though but it popped up somewhere in the cgp book
(Original post by 000alex)
combine s=d/t with v=hd for the speed of light
Requires some annoying unit conversions
Thanks, never got taught that, hopefully it won't turn up again!
7. (Original post by CreamyRoss)
V=Hd so H=v/d which is just speed over distance, which equals 1/t, so to find t (the age of the universe) it is just 1/H. But remember to convert the units from km/s/Mpc to seconds, you'll know if you're right if you get an answer about 13/14 billion years.

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Thanks a lot, makes sense now!
8. (Original post by roar96)
This is true. Although I've always assumed that the second paper must be created at the same time as the first?

There's a chance a question will be wrong and you'll end up with lower boundaries whether it's an original or R paper. I suppose if the second hasn't been looked through as thoroughly it may have more chance of a mistake.

I highly doubt they 'rush' to get this second paper ready... if it was a 3rd paper i'd see why everyone was worried but given that they always have a 2nd, reserve paper I don't see the fuss.

All the same, we shouldn't really see a difference on the day just might end up lucky with boundaries
It was the perception from the media that, AQA had to literally re-write the papers within a very short timespan.

"“There’s nothing to indicate that [the van] was targeted for the papers or that any of them have come to light. However, we don’t leave anything to chance, so as soon as we knew about it, we contacted our senior examiners and asked them to write some brand-new papers,” an AQA spokesman said."

Which gives the impression they didn't have a back-up paper?

There is more chance of a mistake, yeah. The problem I would potentially see is that, the paper may just be a lot harder. Since they usually have to assess the realistic difficulty of the questions. So we may have a bunch of difficult questions, conversely, we may also have the easiest questions in the universe.

I'm not really too fussed about it either. However it effects it us, noticeable or not, grade boundaries are determined in such a way to make that effect irrelevant anyways.
9. Could Anyone help with June 2011 4c please?? I dont understand the markscheme
10. what is a R paper?
11. Do we need to know much about argon and carbon dating?
12. I feel so unprepared for this exam especially considering how hard I found physics 4
13. I don't understand this s=r(theta) formula!
Doesn't r stand for radius and s for the distance to the object? :/
14. Think i found a issue with a previous past paper, in june 2011, q 4a, the units for the heat capacity involves kelvin, however, the method in the mark scheme uses degrees Celsius
15. (Original post by max4078)
this paper is so easy 65/75 at least
all right big man
16. (Original post by simpletech668)
I feel so unprepared for this exam especially considering how hard I found physics 4
Second this, feel like I know nothing!
17. Anyone doing option 3 applied physics? Is there any good resources apart from the Collins book and Teacher guide? I learnt all of this myself but annoyed that the Text book doesnt have the options units. Specifically the thermodynamics and engines part.
18. (Original post by Exams12343)
Think i found a issue with a previous past paper, in june 2011, q 4a, the units for the heat capacity involves kelvin, however, the method in the mark scheme uses degrees Celsius
kelvin and Celsius both go up by the same amount, so if they're working out a difference in temp it doesn't matter which one you use
19. (Original post by Exams12343)
Think i found a issue with a previous past paper, in june 2011, q 4a, the units for the heat capacity involves kelvin, however, the method in the mark scheme uses degrees Celsius
The formula Q=mc(change in )T. So it doesn't matter if you do it in kelvin or Celsius as the difference between them are the same.
20. I put so much effort into unit 4 and smashed it but neglected unit 5 lol, unit 4 is so much better

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