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

• View Poll Results: Are you resitting this unit?
YES!
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NO!
54.70%

1. (Original post by Dizzy in my Head)
I think maybe we should try to make our own question paper and mark scheme.

1. Name two Baryons. Pronton, neutron, could have had Sigma. (2 marks)

2. Give quark structure of a pion*+. up, anti-down (1 mark)

3. What makes a K*+ with a strange quark different to something that has not? Has a strangeness of -1. (1 mark)

Last question -
what is the total resistance of the circuit - 5 ohms
show that this is true if each resistor has resistance 3 ohms - plug in values, perhaps prove that it is infact 3.
Voltage of a certain component - 2V

Correct questions if I'm wrong.
if we just quote eachother and add to it. So ill ad the last question
2. (Original post by Dizzy in my Head)
Yeah, I posted it and I was like 'got it wrong again?!' so I went back and edited it.

I think physics damaged my brain.
Physics damages everyones brains, don't worry.
3. also are we sure that the question about 'what is special about it being strange etc' isnt that it is composed of strange quark(s). Therefore has a strangeness of +1 (if anti strange quark) -1 (if strange quark)
4. not sure 3. is correct

4. Which of these two interactions cannot take place The second interaction because leptopn number is not conserved

5. Why must the charge of X be 0? To conserve charge (0->-1+1)

6. Which is the most stable particle in this interaction? Proton
5. Oh, the last question.

The first one was:

1. Show the resistance of the whole circuit.

It was in parallel, current was 2.0A, Voltage was 10V

So V=IR, rearrange to give R=V/I

R=10/2=5 Ohms

Does this look familiar or did I mess it up?

Circuit labels on resistors are not true to memory...
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6. (Original post by IcedTea&PotNoodle)
I'm not sure that im 100% right but i worked out 40/60 UMS for EMPA and somewhere between 70 and 80 UMS for Unit 1 and you need 240 for an A I think.
I'm still able to get a High B maybe right? =[

If I play to a University [UCL] and they ask for A*AA, and I get the B in physics, but I'm retaking Unit 1 to bump it up to an A, will they accept this? or will they not make me an offer purely based on this? =/
7. Quick question.

State what is meant by the ionisation energy. (13.6MeV or something)

In chemistry I learn the definition as 'the energy in kJ required to ionise one mole of gaseous atoms'

But from this question I got the impression they were referring to one atom so I wrote something like this: 'Energy in MeV required to remove the electron from an atom of hydrogen making a hydrogen ion.'

Is this right? :/
8. Started a thread so everyone put their solutions in that perhaps so its more organised ?
9. technically its the same thing, maybe
10. (Original post by maths134)
Started a thread so everyone put their solutions in that perhaps so its more organised ?
yh good idea, solutions in one questions in another
then mix em up and we're done
11. (Original post by FrightBright)
Im baffled on the 3rd last question. It was a proof question then I prooved it, AND i did get 5 its in my working, but it asked for an answer so I was baffled, and put 3 because each resistor is 3 the way they worded that question is Fu**** retarded.
Exactly the same, they gave you the answer to the question so what were you meant to put!

(Original post by Limitless)
What was the answer to where did the electron come from or something like that.
That was the hardest question of the whole exam..........I put the Big Bang
12. (Original post by TimetoSucceed)
I'm still able to get a High B maybe right? =[

If I play to a University [UCL] and they ask for A*AA, and I get the B in physics, but I'm retaking Unit 1 to bump it up to an A, will they accept this? or will they not make me an offer purely based on this? =/
Only problem is UCL is extremely competitive but honestly I don't think a high B would bother them too much. I personally can't apply because I don't have a language at GCSE. Its a silly new rule they have. And i think you can still get a high B, you only need about another 90-100 UMS.
13. The second of that curcuit question, I remember, was:

2. Show your previous answer was correct, using the fact that each resistor is equal to three Ohms.

Look at parallel first: 3+3=6 Ohms for top line, 3 Ohms for the bottom. Then as they are in parallel, you add them like this:

1/R = 1/6 + 1/3 = 1/6 + 2/6 = 3/6 = 6/3 = 2 Ohms

Add this to the three Ohm resistor in series, it gives you five Ohms.

Is this correct? It gave you an answer box, even though it just told you to prove your previous answer, so I just put in five Ohms...
14. for the first page where they asked which equation was not possible (muon decay i think) which one was the 'not possible' one? i put the second one, thinking that the muon+ is an antiparticle but then i thought does the meson number need to be conserved? thanks
15. (Original post by the.student)
for the first page where they asked which equation was not possible (muon decay i think) which one was the 'not possible' one? i put the second one, thinking that the muon+ is an antiparticle but then i thought does the meson number need to be conserved? thanks
i've never heard of a meson number..
16. (Original post by Dizzy in my Head)
The second of that curcuit question, I remember, was:

2. Show your previous answer was correct, using the fact that each resistor is equal to three Ohms.

Look at parallel first: 3+3=6 Ohms for top line, 3 Ohms for the bottom. Then as they are in parallel, you add them like this:

1/R = 1/6 + 1/3 = 1/6 + 2/6 = 3/6 = 6/3 = 2 Ohms

Add this to the three Ohm resistor in series, it gives you five Ohms.

Is this correct? It gave you an answer box, even though it just told you to prove your previous answer, so I just put in five Ohms...
yeah i notices they shouldnt have given us a space for an answer, so i just put there "so it is right!"
17. (Original post by IcedTea&PotNoodle)
Only problem is UCL is extremely competitive but honestly I don't think a high B would bother them too much. I personally can't apply because I don't have a language at GCSE. Its a silly new rule they have. And i think you can still get a high B, you only need about another 90-100 UMS.
you got no idea how depressed im feeling now man =/ ah well, there's a quote saying:

"A man who has committed a mistake and doesn't correct it, is committing another mistake." - Confucius

my mistake is I didn't put as much effort as I should into Physics 1, I have 2 weeks until Physics 2, in those 2 weeks, I will be revising day and night. My goal is a B now.
18. (Original post by the.student)
for the first page where they asked which equation was not possible (muon decay i think) which one was the 'not possible' one? i put the second one, thinking that the muon+ is an antiparticle but then i thought does the meson number need to be conserved? thanks
There's nothing about 'conservation of meson number' in the syllabus...although, in the second equation, you have a muon+ and an antineutrino so the muon lepton number on the right is -2 as they are all anti particles- so lepton number is not conserved :P
19. (Original post by TimetoSucceed)
you got no idea how depressed im feeling now man =/ ah well, there's a quote saying:

"A man who has committed a mistake and doesn't correct it, is committing another mistake." - Confucius

my mistake is I didn't put as much effort as I should into Physics 1, I have 2 weeks until Physics 2, in those 2 weeks, I will be revising day and night. My goal is a B now.
I wouldn't worry yourself too much, you may have done a lot better than you think you have and there are so many things that affect a university application other than a levels.
20. Anybody remember any other questions and answers they'd like to share?

1. Complete the feynmann diagram. (3 marks)

Shown in the thumbnail.

This is what I did, not sure if it's right. Please, people, I can't do this on my own!
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