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# AQA Physics A - PHYA5 (18/06/12) - Exam thread

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: AQA Physics A - PHYA5 (18/06/12) - Exam thread
Anyone got either this:

http://www.amazon.co.uk/Student-Supp.../dp/0007343868 (Collins student support material)

or this:

http://www.amazon.co.uk/A2-Level-Phy...ref=pd_sim_b_3 (CGP revision guide)

please aware me if they're any good.

(sorry i did post this on the unit 4 thread accidently before, so now its in the right place here for unit 5)
2. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
Thermal physics: "Describe how to measure the specific heat capacity of ice"

Is a possible answer for this :
set up a circuit with a power supply (cell) , ammeter, and a parallel section with a metal contact touching the circuit embedded into a block of ice, a voltmeter in the parallel section to measure the voltage across the ice block/contact. Place a thermometer inside the ice block.

Measure the change in temperature of the ice over a set time.
As P = I V and E/t = P
energy supplied = I V T
and energy supplied over mass of ice block multiplied by the change in temperature over the set time.

This will give c.
as c = Q/m delta T
and Q = IVT

???????????? is this viable!
3. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by TheRenaissanceMan)
If anyone needs help understanding the Mass Defect and Binding Energy

I like it. Even though this isn't really the binding energy and mass defect, they are related to﻿ the energy needed to get free nucleons into their bound state. It is inaccurate to say the energy released in induced fission is the binding energy. But hey good work none the less.
4. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by Hulksmash)
I like it. Even though this isn't really the binding energy and mass defect, they are related to﻿ the energy needed to get free nucleons into their bound state. It is inaccurate to say the energy released in induced fission is the binding energy. But hey good work none the less.

Yeah true, on a different note DOES ANYONE have Old Papers?

People seem to hit really high on Physics 5 so I was wondering where I can get hold of Old Markschemes so I can make notes on the Long winded Questions. I.e. Thermal Nuclear Reactor, Refracting Telescopes vs Cassegrain (Reflecting Telescopes, Classification of Stars, Stellar Evolution and Evidence for Big bang

Please, it seems Physics 5 isn't hard to understand but there is a very specific way of getting all the marks and writing the questions
5. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by desijut)
ok. Let's start with inertial frame of reference. The way i see it is as a point of view where where the objects are stationary or at constant speed (cant be accelerating or it gets more complex)

As for choosing or etc Give me some examples and i will try to explain as best i can which i choose for what and why.
Like in http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN11.PDF Question 4aii) Calculate the distance between the two detectors in the frame of reference of the protons.
I get how to do the first part (4ai), but I don't get why the answer to the first part is l0 not l for use in the next part of the question. :/
6. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by TheRenaissanceMan)
Yeah true, on a different note DOES ANYONE have Old Papers?

People seem to hit really high on Physics 5 so I was wondering where I can get hold of Old Markschemes so I can make notes on the Long winded Questions. I.e. Thermal Nuclear Reactor, Refracting Telescopes vs Cassegrain (Reflecting Telescopes, Classification of Stars, Stellar Evolution and Evidence for Big bang

Please, it seems Physics 5 isn't hard to understand but there is a very specific way of getting all the marks and writing the questions
http://www.freeexampapers.com/past_p...A%2FPhysics+A/
7. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
8. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by Crystal_Heart)
Like in http://store.aqa.org.uk/qual/gce/pdf...W-QP-JUN11.PDF Question 4aii) Calculate the distance between the two detectors in the frame of reference of the protons.
I get how to do the first part (4ai), but I don't get why the answer to the first part is l0 not l for use in the next part of the question. :/
time stays constant for the protons if the length is changing (contracting) so you know that length is contracting, so to get a SMALLER value you do lo x square root 1- V^2/C^2
9. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by internet tough guy)
Anyone got either this:

http://www.amazon.co.uk/Student-Supp.../dp/0007343868 (Collins student support material)

or this:

http://www.amazon.co.uk/A2-Level-Phy...ref=pd_sim_b_3 (CGP revision guide)

please aware me if they're any good.

(sorry i did post this on the unit 4 thread accidently before, so now its in the right place here for unit 5)
I have both- they're ok. I think the Collins ones are better- they're match the specification exactly. Plus CGP doesn't have my option topic (applied) in it. I guess it's more colourful though?
10. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by zoeaw)
I have both- they're ok. I think the Collins ones are better- they're match the specification exactly. Plus CGP doesn't have my option topic (applied) in it. I guess it's more colourful though?
Yeah, I'd go for Collins too. It has all the options in it, and I just generally think it's a useful revision guide. I don't really like CGP because I feel like they dumb stuff down.
11. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by internet tough guy)
Anyone got either this:

http://www.amazon.co.uk/Student-Supp.../dp/0007343868 (Collins student support material)

or this:

http://www.amazon.co.uk/A2-Level-Phy...ref=pd_sim_b_3 (CGP revision guide)

please aware me if they're any good.

(sorry i did post this on the unit 4 thread accidently before, so now its in the right place here for unit 5)
Collins one
the best imo, tells u everything, easy to understand has past papers for each topic as well
12. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
omg thank you so much for the notes, ive only just started revising for unit 5 had so many exams i could only fit in about a few hours for it. im not gonna go through the whole book so i need some notes, if anyone knows any good ones please let me know, topics: radioactivity, nuclear energy and finally thermal physics, thanks in advance
13. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by Abdullah CEO)
omg thank you so much for the notes, ive only just started revising for unit 5 had so many exams i could only fit in about a few hours for it. im not gonna go through the whole book so i need some notes, if anyone knows any good ones please let me know, topics: radioactivity, nuclear energy and finally thermal physics, thanks in advance
You may want these, I was given these notes in two parts.
Attached Files
14. Introduction to Nuclear physics.docx (435.4 KB, 88 views)
15. Nuclear Energ1.docx (136.0 KB, 68 views)
16. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
For astrophysics, do we only need to know about the main features of neutron stars, white dwarfs, giant stars, black holes and quasar etc? Not the details of their formation??
17. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
Hey could anyone explain to me where alpha emitters are on the N-Z curve of stability, my book tells me where the beta minus and beta plus emitters are but not the Alpha ones. Cheers
18. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by Funky Monk)
Hey could anyone explain to me where alpha emitters are on the N-Z curve of stability, my book tells me where the beta minus and beta plus emitters are but not the Alpha ones. Cheers
Above z=60 because when the nucleus gets larger, the strong nuclear force can no longer control the electrostatic repulsion between the protons, which is usually why the number of neutrons increase as you go down the periodic table.
19. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by FrightBright)
Above z=60 because when the nucleus gets larger, the strong nuclear force can no longer control the electrostatic repulsion between the protons, which is usually why the number of neutrons increase as you go down the periodic table.
Ahh thanks for you reply (Y) Are you saying its above the line N=Z or above the curve? because i would understand if it was under the curve as it is losing 2 protons and 2 neutrons so it will follow the same path as the N=Z line.
20. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
why is it that medical physics has so few formulas given in the formulae booklet compared to other topics?

are other options alot more mathematical?
21. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
(Original post by Funky Monk)
Ahh thanks for you reply (Y) Are you saying its above the line N=Z or above the curve? because i would understand if it was under the curve as it is losing 2 protons and 2 neutrons so it will follow the same path as the N=Z line.
It has to be on the curve beceause the N=Z line only applies to small molecules up to around z=20.

Remember decay is random, so it can still emit beta or literally split into two when large.

However it mainly releases alpha at high Z values because it wants to become more stable. The higher the binding energy per nucleon the more stable the nucleus.

Yes it does follow the same path it goes two down and two to the left, usually then a beta- is released to get it back near center.
22. Re: AQA Physics A - PHYA5 (18/06/12) - Exam thread
Is there anywhere where you can find exam questions by topic?

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