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# AQA Physics Unit 1 PHYA1 20th May 2013 Watch

1. (Original post by Goods)
I thought the Jan paper was easier so i would say its likely to be 68/70 again. (That could be because i think i got 68/69 but meh)
Good stuff, hopefully we can afford to lose 1 or 2 marks as you always do
2. (Original post by StalkeR47)
Photon does have a mass. Every particle has a mass.
Light are photons, If photons have mass we should be crushed by the weight of light... either they dont have mass or were all made of diamond hmmm
3. (Original post by EllBailz)
Did you get 1/R=1/4.22222222 + 1/2 +1/1.5
So R = 0.71?
That's what i wrote but it's wrong because apparently the internal resistance is counted as being in series so you just add it on without doing 1/1.5 or whatever it was.
4. it seems to ambiguous, they should have stated whether the resistance was for the battery and the other resistors or just for the resistors
5. (Original post by amar96)
Light are photons, If photons have mass we should be crushed by the weight of light... either they dont have mass or were all made of diamond hmmm
This argument is so ****ing stupid.

Electrons and protons also have mass, we don't get crushed by them do we?

Plus photons have momentum, so they can still cause impact

Seriously. Don't argue something if you don't genuinely know the answer
6. (Original post by baker96)
For the charge of the ion, I did 2 x -1.6 x 10^19 to get a negative charge, will this matter?
Maybe you will lose one mark. It had to be positive charge
7. (Original post by g.k.galloway)
No as the internal resistance was effectively in series

so I did 1/R = 1/2 + 1/4.22222

find R

then +1.5

= 2.86 ish
you would write this to be 2.9 to 2 s.f. right? the values given for the resistance and voltage was to 2sf.
8. (Original post by g.k.galloway)
No as the internal resistance was effectively in series

so I did 1/R = 1/2 + 1/4.22222

find R

then +1.5

= 2.86 ish
Ah that's right because that makes a current of 4.2, fair enough
9. Could someone please do an Unofficial mark scheme?
10. (Original post by StalkeR47)
you would write this to be 2.9 to 2 s.f. right? the values given for the resistance and voltage was to 2sf.
As long as it didn't ask for significant figures in the question and you wrote out the whole answer somewhere in your workings you will get full marks
11. (Original post by cyfer)
This argument is so ****ing stupid.

Electrons and protons also have mass, we don't get crushed by them do we?

Plus photons have momentum, so they can still cause impact

Seriously. Don't argue something if you don't genuinely know the answer
do photons have Electrons and protons inside them also the photon is governed NOT by its mass or its velocity but by its relation to frequency e=hf so its so called 'momentum' does not create the impact but the frequency of light it is coming with
12. For the last question, you had to do 40000 - 10000 for the final step, if i wrote 40000 - 10 to get 39990, how many marks would i lose. Yes i know it was a stupid mistake haha!
13. (Original post by EllBailz)
Ah that's right because that makes a current of 4.2, fair enough
Give me a paper and I will
14. (Original post by kingmango)
For the last question, you had to do 40000 - 10000 for the final step, if i wrote 40000 - 10 to get 39990, how many marks would i lose. Yes i know it was a stupid mistake haha!
You'll get 1/2 if you found out the resistance had to be 40000.
15. (Original post by amar96)
Light are photons, If photons have mass we should be crushed by the weight of light... either they dont have mass or were all made of diamond hmmm
Definitely photon has a mass. Not in tonnes that it would crush us lol. But I hope you got the mark for saying it doesn't.
16. (Original post by pilotluke1)
Could someone please do an Unofficial mark scheme?
We need the paper really
17. Gutted at the number of silly mistakes that I made... Could have got full marks had I at least checked the paper again... So flipping frustrating
18. the Oscilloscope question was 16V per division and 2ms per division, and it was out of 3 marks, does anyone know what the 3rd mark was for?
19. (Original post by StalkeR47)
Definitely photon has a mass. Not in tonnes that it would crush us lol. But I hope you got the mark for saying it doesn't.
Incorrect. Photons have 0 rest mass.
20. (Original post by kingmango)
For the last question, you had to do 40000 - 10000 for the final step, if i wrote 40000 - 10 to get 39990, how many marks would i lose. Yes i know it was a stupid mistake haha!
2. One for working, one for the answer

(Original post by amar96)
do photons have Electrons and protons inside them... for momentum you need mass p=mv
I hope to God you're trolling. How did you even attempt this paper with such an ignorant outlook?
No they don't have electrons or protons.
No, there is a different equation for the momentum of a photon, based on planck's constant

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