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# AQA Physics Unit 1 PHYA1 20th May 2013 watch

1. (Original post by FrankB3)
Nah mate, they meant between Leptons and Hadrons, as far as I could tell. I wrote the differences between both of them anyway. But I think they meant leptons and hadrons.
1 thing how many similarities are between hadrons and leptons
2. (Original post by Ephixa)
1 thing how many similarities are between hadrons and leptons
I put that they were both matter and anti-matter and that leptons could decay into hadrons
3. (Original post by 123456789012)
What did you get for the specific charge? I got 4.0x10^7 Ckg^-1.
Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep

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4. (Original post by 123456789012)
What did you get for the specific charge? I got 4.0x10^7 Ckg^-1.
yes that definitely rings a bell - i think I wrote down 3.99 x 10^7 or something like that.
5. (Original post by jazzynutter)
How many similarities between hadrons and leptons were we supposed to come up with?

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I got one, I said that Hadrons and Leptons both interact via the EMF if the particles are charged.
6. the charge was 2+ so it's 2*1.6*10/19 over the mass
7. (Original post by Son234)
Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep

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I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?
8. (Original post by Maloneyyy)
I'd be very careful with that one...
9. (Original post by Son234)
Specific charge-->

(20X1.6X10^-19)/(20X1.673x10^-27)+(28X1.675x10^-27)=

4.0X10^7 CKg-1

Yep

This was posted from The Student Room's iPhone/iPad App
Would it not be (38X1.6X10^-19)/(48X1.67X10^-27) because it was the specific charge of the ion and not just the nucleus so the charge would be the protons and the electrons over the mass?
10. (Original post by samueliscool)
I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?
you are correct
11. (Original post by 123456789012)
4.0x10^6
I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.
Edit, just did a calculation including masses of electrons but I still got 4x10^6. I guess the masses of electrons is negligible.
12. similarities were that they both have antiparticles
13. (Original post by Notorious544d)
I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.
mass of electrons is negligible, not once have I seen you have to include their masses.
14. For the prove that energy is conserved i used v^2/R and rounded values of R think I will lose a mark for that?

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15. Anyone got an unofficial mark scheme?
16. (Original post by Notorious544d)
I also got this, using charge as +2 not +20. But now I'm thinking about it, I forgot to add the masses of the electrons.
I believe the masses of the electrons are so negligible that it doesn't influence the specific charge
17. (Original post by samueliscool)
I got to the power of 6, as I thought the charge was 2x1.6x10^-19 as there are two more protons than electrons?
As did I. Not entirely sure what the other poster means, but I did the sameas you. Charge was +3.2x10^6. We could, of course, be wrong..

Electricity was killer though.. Probably dropped most of the marks available there

Any idea if there will be a mark scheme up for this, similar to how they do it for maths?
18. (Original post by lebron_23)
As did I. Not entirely sure what the other poster means but I did the same. Charge was +3.2x10^6. We could, of course, be wrong..
you are correct. I've seen this in many past papers

the mass of electrons is negligable, you never include it
19. (Original post by Maloneyyy)
Would it not be (38X1.6X10^-19)/(48X1.67X10^-27) because it was the specific charge of the ion and not just the nucleus so the charge would be the protons and the electrons over the mass?
Hmm I think your right it was the ion?!

In that case it would be 38! Im not sure if it was the nucleus or the ion they asked for

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20. (Original post by samueliscool)
I believe the masses of the electrons are so negligible that it doesn't influence the specific charge
Yeah both answers gave 4.0 x10^6 I worked out both to check

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