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# PHYA1 - Physics Unit 1 Exam - 24th May 2011 watch

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1. (Original post by A level Az)
How did you get to that answer? Did you take away the last point from the first and divide it by the total current?
Yep, just drew a triangle and found the gradient.
Firstly along the y axis which was 1.52 from the highest point (of the triangle) subtracted by 0.08 which was the lowest point. Then divided by the highest and lowest on the x axis which was just 3.20 because the lower was 0.00 :P
2. It was 2 marks i think, you'll get 1 for Baryon
3. (Original post by masr123)
50/70 for an A ? what do people think ?
I agree, 50 - 53 Minimum.

Maximum I would say about 57.
4. (Original post by Mr XcX)
I agree, 50 - 53 Minimum.

Maximum I would say about 57.
57 !? kidding right ?. seriously the MOST its been is 53 for far easier papers. The mark for 100% is often 62-63.
5. (Original post by chemkid)
For the proof question i proved that the resistance of the resistors was 3, using my answer of 5 ohms from the previous question - would i still get marks for that?
i.e. i did 1/2r + 1/r = 1/rt
rt = 2r/3

2r/3 + r = 5
5r = 15
r = 3
i did this first also however crossed it all out and did it on an extension sheet with a little note i think you will defnitely get some credit for it, many full marks if enough people did it in the exam
6. (Original post by maths134)
57 !? kidding right ?. seriously the MOST its been is 53 for far easier papers. The mark for 100% is often 62-63.
lol, sorry I was thinking of the Chemistry papers then.
7. for the question about 'what is X'. i put a meson instead of a baryon because im an idiot, at the top of the next page where we had to explain it, i said because a meson is a hadron, which interacts via strong force and decays via weak force and this interaction was via weak force. think i will get any of the 3 marks for it all ?

Just to say what I remember of the question:

1. The K particle thing decays to Ar through B*+ decay. Complete the equation.

The only reason they give you Ar is so you can write the correct symbol down when filling in the missing gaps. You also had to write down an electron-neutrino, and the beta particle. I think the proton number for Ar was like 18.
9. (Original post by Dizzy in my Head)

Just to say what I remember of the question:

1. The K particle thing decays to Ar through B*+ decay. Complete the equation.

The only reason they give you Ar is so you can write the correct symbol down when filling in the missing gaps. You also had to write down an electron-neutrino, and the beta particle. I think the proton number for Ar was like 18.

Potassium with Atomic number 19 decays (mass number of 40 as i remember?) into an argon atom nuclear charge 18 (mass number still 40) plus a positron (i put a note saying beta plus symbol = positron as didn't know which one they would want) and an electron neutrino
10. (Original post by Tyrone-C)
I disagree on the part where you said the 2nd reaction is impossible, remember that this is a decay, and that stange particles only decay by the weak interaction as it allows the QUARK FLAVOUR to be changed.

"a strange quark cannot decay by the strong interaction, and must instead decay via the much slower weak" - Wikipedia

Therefore the 1st equation wasn't possible.
i think the much simpler and obvious one to go with would be the vialation of lepton conservation law in the second
11. Neither equation conserved strangeness so you're not going to get marks for writing that as both occured through the weak.

But I was wondering, would I gain the marks for the electron capture question if I stated the electrons come from the potassium atom?

And how many marks do you guys feel for 120 ums?

Thank you
12. i think 60-62 for 120ums
13. Should have nailed this paper to be honest -.- Electricity questions were my downfall No photoelectric or resistivity! Unbelievable.
14. (Original post by Notsocleverstudent)
Neither equation conserved strangeness so you're not going to get marks for writing that as both occured through the weak.

But I was wondering, would I gain the marks for the electron capture question if I stated the electrons come from the potassium atom?

And how many marks do you guys feel for 120 ums?

Thank you
was it potassium that was decaying via electron caputre? if so then thats true although a but more detail like from the 1st or 2nd shell of the atom or an atomic electron may be the extra mark
15. I got 0.67 A and 4V for the last two, do you think ill get atleast 1 mark ? :/
16. guys with 40/60 for Empa and say 40/70 for the Unit 1, can someone give me a rough estimate on how many marks out of 70 I'd need to get in Unit 2 for an A [if possible] and for a B?

would help a lot =/
17. (Original post by Msd27)
was it potassium that was decaying via electron caputre? if so then thats true although a but more detail like from the 1st or 2nd shell of the atom or an atomic electron may be the extra mark
It was 1 Mark
18. (Original post by TimetoSucceed)
guys with 40/60 for Empa and say 40/70 for the Unit 1, can someone give me a rough estimate on how many marks out of 70 I'd need to get in Unit 2 for an A [if possible] and for a B?

would help a lot =/
I'm not sure how many ums empa is worth but 40/70 would get you around 70-75 ums probably
You need 240 total to get A and 210 to get B
19. (Original post by A level Az)
Should have nailed this paper to be honest -.- Electricity questions were my downfall No photoelectric or resistivity! Unbelievable.
I know right! No photoelectric effect!!!! I was SO SO SO prepared for it, and then it didn't even come up?!

This year's exams papers on the whole seem to be odd, Chem1 AQA was nicer than I thought with a lot of "suggest ..." questions, History AQA decided to give really hard papers with silly date frames
20. (Original post by TimetoSucceed)
guys with 40/60 for Empa and say 40/70 for the Unit 1, can someone give me a rough estimate on how many marks out of 70 I'd need to get in Unit 2 for an A [if possible] and for a B?

would help a lot =/
this is assuming a lot... did u get 40 ums out of 60 ? or raw marks because arnt empas/isas out of 50 raw marks. Anyway if it is ums, then 40/70 will probably be a C (jan conversion) which was 70umns. So thats 110. You would need 130 which is not possible. So no A. Btw this is quite easy to do via AQA ums converter, next time do it yourself.

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