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

Reply 2060

khiz

Original post by xela238

Does that to change anything?

Sorry what's an R paper?

Reply 2061

username1204031

14

I've got pretty much the whole unit (section A and B, astro) left to revise (I'm a moron). I've so far found that the CGP revision book (not the one linked in the OP but I think it's exactly the same?) isn't great at all for A2 physics - it doesn't go into much depth and I've found that I don't really understand stuff (and I can't answer questions) when I've used it (it was brilliant for AS though!)

I really need an in-depth revision resource so I can get everything done ASAP so I can do some past papers. I've been looking at the online revision guide linked in the OP and I did use it for some of unit 4, but since it's a free resource I'm not really sure. So I was just wondering if anyone that's used it could give me some advice - is it useful and really accurate, and could I use it as my main source of revision? If I go through the whole guide can I expect to know all the content?

Any other revision resources or tips would be very much appreciated. Thanks!

Reply 2062

betbi3etwerrd

2

Original post by lukejamo

Do we need to know how to fully derive pV = 1/3 N m (Crms)^2

yes

Reply 2063

khiz

Original post by betbi3etwerrd

Can I ask what unit this is for ?

Turning points - option D

Reply 2064

roar96

8

Original post by lukejamo

Do we need to know how to fully derive pV = 1/3 N m (Crms)^2?

I have. There was one question during past papers that it was useful for. Definitely something you'll regret not learning if it does come up!

Reply 2065

xela238

3

Original post by JordanL_

I've got pretty much the whole unit (section A and B, astro) left to revise (I'm a moron). I've so far found that the CGP revision book (not the one linked in the OP but I think it's exactly the same?) isn't great at all for A2 physics - it doesn't go into much depth and I've found that I don't really understand stuff (and I can't answer questions) when I've used it (it was brilliant for AS though!)

I really need an in-depth revision resource so I can get everything done ASAP so I can do some past papers. I've been looking at the online revision guide linked in the OP and I did use it for some of unit 4, but since it's a free resource I'm not really sure. So I was just wondering if anyone that's used it could give me some advice - is it useful and really accurate, and could I use it as my main source of revision? If I go through the whole guide can I expect to know all the content?

Any other revision resources or tips would be very much appreciated. Thanks!

Try CD223 guide on the first page, really useful

Reply 2066

dominicwild

6

Original post by roar96

All it means is we'll have a different paper from the one that was originally intended for us....

We shouldn't see a difference apart from the letter R on the paper's code. Don't know why everyone seems to think it's such a big thing!

I think its because they've quickly had to remake an exam. Usually they have exams prepared much in advance and checked frequently. I guess the perception is that the paper may be harder/abnormal as it hasn't been as thoroughly looked over and assessed to be suitable?

I remember Edexcel for maths, I think two years ago, had some dilemma and made a crazy hard paper, with crazy low grade boundaries.

Reply 2067

simpletech668

12

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!

Reply 2068

Beckyboo308

What's everyone's predictions for the 6 marker?

Reply 2069

Aman.1

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!

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

Reply 2070

000alex

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!

combine s=d/t with v=hd for the speed of light
Requires some annoying unit conversions

Reply 2071

max4078

this paper is so easy 65/75 at least

Reply 2072

roar96

8

Original post by dominicwild

I think its because they've quickly had to remake an exam. Usually they have exams prepared much in advance and checked frequently. I guess the perception is that the paper may be harder/abnormal as it hasn't been as thoroughly looked over and assessed to be suitable?

I remember Edexcel for maths, I think two years ago, had some dilemma and made a crazy hard paper, with crazy low grade boundaries.

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 :smile:

Reply 2073

Jimmy20002012

4

Original post by gcsestuff

We don't need to know it just that time goes slower for the moving object

Posted from TSR Mobile

So if a twin was going on a journey the twin who went on the rocket to a distant planet would be older since they have accelerated and de- accelerated hence are not in an inertial frame of reference?

Posted from TSR Mobile

Reply 2074

Sbarron

3

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??

Reply 2075

CreamyRoss

1

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.

Posted from TSR Mobile

Reply 2076

Lau14

11

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.

Reply 2077

SuperMushroom

9

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

Reply 2078

Sbarron

3

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

Reply 2079

simpletech668

12

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!

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

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