You are Here: Home >< Physics

# AQA Physics PHYA5 - 28th June 2016 [Exam Discussion Thread] Watch

1. (Original post by Whizbox)
Is there a question in a past paper like that?
To my surprise, no. In the textbook try question 2(b) on page 195.
2. (Original post by particlestudent)
Can someone explain the nuclear radius experiment briefly to me, I don't understand the graph minima at all
im not sure if someone answered this but basically electrons also have wave-particle duality or whatever so they have a de broglie wavelength if they go fast enough and the graph is showing the diffraction pattern so if you look on the notes on physicsandmathstutor and scroll down youll find a picture on the diffraction pattern and it made much more sense to me after i saw that
3. (Original post by Cheesecake Ali)
Is it just me that finds electron microscopes in turning point extremely hard to learn cuz it's so boring 😪

Posted from TSR Mobile
-thermionic emission
-magnetic lens - condenses electron been towards sample
-(sample)
-objective lens - deflects and inverts scattered electrons
-(Inverted first image)
-microscopic lens- focuses on centre of first image and inverts into high resolution final image
-(final image)

-limitations
- Thickness of the sample can cause the electron beam to slow down therefore reducing de broglie wavelength and worsening resolution
- uneven thickness of sample can cause different amounts of diffraction for electron beam therefore making the distorting final image.

(I did this mainly for my own revision... but this is pretty much all you need to learn about them)
4. (Original post by ReeceFraser)
Can someone explain what the avagadro constant is and how to use it?
so the Avogadro's constant is like how many particles in a mole of gas, so if you know how many moles the gas is you can multiply by the constant and u get how many molecules. If you know the nucleon number that is how many molecules are in one gram and then u can find its mass, from the number of molecules and the molar mass. I hope this helps to be honest im not entirely clear on it either
5. (Original post by rory58824)
To my surprise, no. In the textbook try question 2(b) on page 195.
(((63.92915 - 30*5.5*10^-4)-(30*1.00728+24*1.00867))*931.5)/64

6. (Original post by C0balt)
I'm more ****ed for this exam than I was for every other exam, the problem of this exam being the last one is that I put revision off for this for ages lmao
I think that's the case with everyone lol
7. (Original post by Whizbox)
((63.92915 - 30*5.5*10^-4)*931.5)/64

Nearly. After calculating 63.92915 - 30*5.5*10^-4, you need to find the mass difference. Then you can calculate the binding energy per nucleon. But the initial calculation is fine.
8. (Original post by rory58824)
Nearly. After calculating 63.92915 - 30*5.5*10^-4, you need to find the mass difference. Then you can calculate the binding energy per nucleon. But the initial calculation is fine.
Realised that the second i pressed reply and my internet stopped so wouldn't let me edit it, thanks
9. (Original post by ReeceFraser)
Can someone explain what the avagadro constant is and how to use it?
A measure for how many objects are in a mole of objects. A mole and avagadro's constant are just measurements for things (doesn't have to be atoms). In this case, you use avagadro's number to convert between atoms and moles.

So number of moles = number of atoms/avagadro's constant
10. Any predictions for the 6 markers (Thermal/Nuclear and Astrophysics)
11. (Original post by ViKZZ)
Any predictions for the 6 markers (Thermal/Nuclear and Astrophysics)
i reckon formation of stars for astro, never come up and huge bit of the textbook
12. (Original post by TajwarC)
I think that's the case with everyone lol
I was like "oh it's fine it's two months away" and now quickly "well **** it's tomorrow fml"
13. Can someone briefly explain an experiment to determine the Specific heat capacity? Including how to get it from a graphical solution.

Im not entirely sure how I would go about it and its not mentioned in the text books.

Something along the lines of using a heater of a known Power(W) & stopwatch to work out energy(J) and recording temperature at different times..? Will plotting a graph of Q against T give you a gradient of mc?(Q=mc.(delta)T)
14. (Original post by DonPedrodoc)
What do we need to know about CCD's (Option A)

That is literally everything you need to know about CCDs.
15. (Original post by C0balt)
I was like "oh it's fine it's two months away" and now quickly "well **** it's tomorrow fml"
After tomorow ima hibernate for a good month
16. (Original post by AQATrolledMe)
After tomorow ima hibernate for a good month
I wish i could literally hibernate until results day. The wait is going to kill me
17. Any predictions
Any predictions
There'll be one question and one question only that's worth 6 or 7 marks
19. (Original post by WillRose)
i reckon formation of stars for astro, never come up and huge bit of the textbook
Could you possibly outline this for me?
20. https://e4cf8bb391554b7c9d8e0fc42269...0Energy.pdfCan someone please explain question 11b to me please? I dont get why or even how the mark scheme has taken the electrons mass away. Mark scheme:https://e4cf8bb391554b7c9d8e0fc42269...nergy%20MS.pdf

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: August 19, 2016
Today on TSR

### Anxious about my Oxford offer

What should I do?

### Am I doomed because I messed up my mocks?

Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• Poll
Useful resources

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups
Discussions on TSR

• Latest
• ## See more of what you like on The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

• The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE