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# AQA Physics Unit 1 PHYA1 20th May 2013 watch

1. (Original post by GeneralOJB)
True. Not sure why it was 2 marks then, but at least I got em.
This confused me as well. Looking through the past papers + specimen, the only similar question I can find is from May 2011, Question 6cii), "Draw a line on the graph ... that shows the results obtained from a cell with the same emf but negligible internal resistance...", which was only worth 1 mark, so I'm not sure where the other mark comes from either.
2. (Original post by Zakee)
It's only one horizontal line as a direct current doesn't reverse direction remember. It just flows in one conventional direction. If it were two horizontal lines, that would mean a current is flowing simultaneously in both directions which, well, is baffling.
That does make sense, as rms value means you have squared all the voltage values to not get them negative.

I must have got confused and thought you could reverse the current like you can in a circuit. Lucky I didn't draw it :P
3. Hello guys... who sat for the unit 1 aqa physics today. 20/05/2013
4. (Original post by GeneralOJB)
True. Not sure why it was 2 marks then, but at least I got em.

I presume it being a straight line (one mark) as a constant voltage. Also realizing the DC is actually the RMS value (so drawing along the 45/45.3V or your RMS value) - second mark.

For example, someone may draw a straight line but in the wrong place (one mark). Or may draw an incomplete line for the DC at 45.3/sinusoidal wave starting at 45.3V.
5. all of us!
6. Can somebody please tell me how many marks each part was worth on questions 6 and 7? i can't remember for the life of me but I know I have some bits rights and others wrong so I wanna know how many marks I've lost :P
7. (Original post by Khenir)

0.75 = 5000*I
so I = (0.75/5000)

I didn't think properly and had this:

5.25 = I*(5000 + R)

and then I realised that I*5000 was 0.75 (since I'd done it earlier DUH).

so 4.5 = IR = (1.5*10^-4)*R

so R= (4.5)/(1.5*10^-4) = 30,000.
Thank you
8. Think only marks I lost on question 7 were for the LDR, 2 marks gone down the drain. Hopefully I get 6 out of 6 on question 3.
The minute I saw it was a hadron lepton question , I raised my head and thanked Allah(God)
9. (Original post by Qari)
Think only marks I lost on question 7 were for the LDR, 2 marks gone down the drain. Hopefully I get 6 out of 6 on question 3.
The minute I saw it was a hadron lepton question , I raised my head and thanked Allah(God)
Ma Sha Allah! But the thing is, since the question was easy most people did pretty well. And therefore as a result, grade boundary might rise.
10. (Original post by StalkeR47)
Ma Sha Allah! But the thing is, since the question was easy most people did pretty well. And therefore as a result, grade boundary might rise.
It depends though, I mean maybe not everyone is strentgh is Hadrons & Leptons, but I know what you mean. I'm confident that I got 80% of the Maths questions right.
BTW for question 1 most people got 4.0x10^6 but I got 3.99x10^6 would I get a mark?
11. (Original post by Declan_Brennan)
Can somebody please tell me how many marks each part was worth on questions 6 and 7? i can't remember for the life of me but I know I have some bits rights and others wrong so I wanna know how many marks I've lost :P
6ai) pd of battery - 1 mark
ii) pd of R - 1 mark
iii) Current through 2ohm resistor - 1 mark
iv) Current through R - 1 mark
v) Resistance of R - 1 mark
vi) Overall resistance - 2 marks
b) Table of power values - 3 marks
c) Proof of energy conservation - 2 marks
(Total 12)

7ai) Current in circuit - 1 mark
ii) Voltmeter reading - 1 mark
b) Effect on Voltmeter reading if intensity of light striking LDR increases - 2 marks
c) Resistance of the variable resistor - 3 marks
(Total 7)
12. Just unit 2 to focus on now!

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13. (Original post by Qari)
It depends though, I mean maybe not everyone is strentgh is Hadrons & Leptons, but I know what you mean. I'm confident that I got 80% of the Maths questions right.
BTW for question 1 most people got 4.0x10^6 but I got 3.99x10^6 would I get a mark?
I put 3.99x10^6 - it's 3 s.f. and you aren't being assessed for significant questions on that question so you should get the marks.
14. (Original post by Qari)
It depends though, I mean maybe not everyone is strentgh is Hadrons & Leptons, but I know what you mean. I'm confident that I got 80% of the Maths questions right.
BTW for question 1 most people got 4.0x10^6 but I got 3.99x10^6 would I get a mark?
I think you should do since the question did not stated the accuracy of the sig fig.
15. (Original post by Qari)
It depends though, I mean maybe not everyone is strentgh is Hadrons & Leptons, but I know what you mean. I'm confident that I got 80% of the Maths questions right.
BTW for question 1 most people got 4.0x10^6 but I got 3.99x10^6 would I get a mark?
i got the same as you, i dont think they care about the significant figures unless they tell you so
16. (Original post by Kayakayakaya)
question 4, about the frequency being reduced, surely this has no effect unless the frequency is below the threshold frequency?
I agree. I said no effect because intensity doesnot affect what ver the question says?
17. Just looking to clarify a few things:

2b) I wrote that the photon is virtual and cannot be detected whereas the weak boson can.

2c) I wrote about the particle as a whole, saying that the charge from a proton (+1) is preserved with the charge of the positron, would that be okay?

4cii) I wrote that the kinetic energy of the electrons would decrease until it was below the threshold frequency where no electrons would then be emitted?

6b) For the values in the table is it okay that I rounded to 1 dp?

7b) If i accidentally read the question as the light intensity decreasing but explained it correctly, would what happen then?

Thanks
18. (Original post by Kayakayakaya)
question 4, about the frequency being reduced, surely this has no effect unless the frequency is below the threshold frequency?
That's what I put but I'm the only person I know that did It may reduce their energy but they're still being emitted surely? (Until it's below the threshold)
19. Will I be penalised for giving all my answer to 1 DP??
20. (Original post by marumakan)
I agree. I said no effect because intensity doesnot affect what ver the question says?
It does the kinetic energy would be lower

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