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

1. (Original post by Music With Rocks)
Which textbook is this?

I would have thought it was 25/1.5^2 = 11.1

So I don't get that answer either for the corrected count rate
It's from the 2008 paper
2. (Original post by Alby1234)
It's from the 2008 paper
Oh wait,The background count rate is 120 counts per minute

So therefore corrected count rate at beginning = 25 - 120/60 =23
Corrected count rate after = 23/1.5^2 = 10.22...
Corrected count rate + background count = 10.22,,, +120/60 = 12.2 (3sf)
3. How do I do (b) and (c)? Topic 2.3 Turning points (OPTION D)

2. When a metal surface is illuminated with light of wavelength 410 nm, photoelectrons are emitted with amaximum kinetic energy of 2.10 × 10−19 J.Calculate:
a the energy of a photon of this wavelength
b the work function of the metal surface
c the stopping potential for this surface illuminated by light of wavelength 410 nm

So for part
(a) E=hc/lambda =(6.63*10^-34)*(3*10^8)/410*10^-9
E=4.85*10^-19 j

then I thought
(b) work function = hf - Ek
=4.85*10^-19 - 2.10*10^-19
= 2.75*10^-19

but this is wrong textbook answer is 1.61*10^-19j

What am I doing wrong?
4. Anyone got a table of grade boundaries?
5. Anyone else here absolutely despise Astrophysics 😂😂
6. What's the range of an alpha particle and beta in a vacuum?
7. (Original post by Nikhilm)
What's the range of an alpha particle and beta in a vacuum?
Infinite
8. (Original post by Nikulp68)
Infinite
and beyond?

9. Can anyone explain why for 1bii they've ignored the neutrons completely in the MS?

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10. They don't have any binding energy, so they can be ignored.
11. lack of past papers for this exam is sooooooooo irritating
12. Watching
13. (Original post by WillRose)
lack of past papers for this exam is sooooooooo irritating
Have a look at old spec papers mate. Unit 8 is the name of one of the papers: It has Nuclear Radioactivity and the second part of the paper is the optional unit that we have now

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14. (Original post by Yo12345)
Have a look at old spec papers mate. Unit 8 is the name of one of the papers: It has Nuclear Radioactivity and the second part of the paper is the optional unit that we have now

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ah okay? where can i find them, do you have any links? thanks
15. (Original post by WillRose)
ah okay? where can i find them, do you have any links? thanks
http://theallpapers.com/assessment-a...iance/a-level/

Click Physics A on the menu.
16. (Original post by WillRose)
ah okay? where can i find them, do you have any links? thanks
They are on the AQA website I think. Older past papers or something along those lines

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17. Anyone doing medical?
18. Boundaries are like 53/54 (excluding 2015) for an A* .....why?

Turning points is usually higher though
19. (Original post by particlestudent)
Boundaries are like 53/54 (excluding 2015) for an A* .....why?

Turning points is usually higher though
I think because some people can already tell what they need / its the last exam for most people / no multiple choice / different sections
20. Alright so who else has a **** of a teacher that made them do turning points?

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