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# AQA Physics PHYA4 - 20th June 2016 [Exam Discussion Thread] watch

1. spent every bloody holiday in the library, revised for hours, and except 6 marker this was **** for me. Even worse, apparently im the only person who found it hard, so high boundaries. a D if i'm lucky. I'll just take a gap year, then try get into an apprenticeship. AAB required for surry, physics won't be more than a C after this.
2. (Original post by Rahul.G)
No it was not that. You had to use ln0.2 not ln0.8
3. (Original post by Rahul.G)
No it was not that. You had to use ln0.2 not ln0.8
**** , i think you might be right there lol
4. What did people get for the extra energy stored in the capacitor for question 1 section B
5. (Original post by duncant)
got this but I got RC=28s? 45/-ln(0.2)
yeah i got same. I think people missed the 'decrease BY 80% '
6. (Original post by Rahul.G)
No it was not that. You had to use ln0.2 not ln0.8
your right, how many marks was it?
I got 200s for time constant?

That was ok - some easy parts and some harder parts. I suspect grade boundaries will be normalish (62/75ish for 120 UMS).
I think I might have got that
8. (Original post by RUNSran)
yeah i got same. I think people missed the 'decrease BY 80% '
Oh sh*t! Praying for low grade boundaries now
9. Boundary predictions? CAP?
10. (Original post by duncant)
got this but I got RC=28s? 45/-ln(0.2)
Ahh no you are right...i forgot to ln...silly me
11. (Original post by Beautywithabrain)
I think I might have got that
27.96 for time constant

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12. (Original post by duncant)
got this but I got RC=28s? 45/-ln(0.2)
I got 28s too for the time constant, then around 59000 ohms I think for resistance

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13. I worked out the energy of the capacitor by the area under the graph - is this valid?

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14. (Original post by Beautywithabrain)
I think I might have got that
It will be that for the A*, 120 will be a bit higher I reckon
15. what did people say for the effect when that guy recorded only half of T? was it (1/4)g?
16. (Original post by Rahul.G)
No it was not that. You had to use ln0.2 not ln0.8
I got 200s (2sf) - actually, I think it's right.

The question asked for a decrease TO 80% of its original value. (I'm almost certain).

Thus e^(t/RC) = ln(1.25)=t/RC
I got 200s (2sf) - actually, I think it's right.

The question asked for a decrease TO 80% of its original value. (I'm almost certain).

Thus e^(t/RC) = ln(1.25)=t/RC
The question definitely specified decreased by 80%, standard AQA trick
18. (Original post by perpetua)
Boundary predictions? CAP?
62 is my guess for cap - there were some easier and some harder parts, so I would imagine it will be 4 marks higher than last year but 5 or so lower than June 13.

Plus I would imagine the facility of the multiple choice is a lot lower than usual (maybe 60% rather than 67%).
19. (Original post by duncant)
what did people say for the effect when that guy recorded only half of T? was it (1/4)g?
Would it not be 4g because the gradient of the graph was 1/g?
20. (Original post by RUNSran)
yeah i got same. I think people missed the 'decrease BY 80% '
what if I wrote 30 secs !??? this was such a bad paper omds

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