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# AQA Physics Unit 1 PHYA1 20th May 2013 watch

1. for jan 13 question 2 b i understand how they got the rest energies of both the electrons but y did they x it by 1.6x10^-13 were usually from ev to j you times by 1.6x10^-19
2. Rest energy is rest mass times c squared
E=mc2

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3. (Original post by Micheal123456)
for jan 13 question 2 b i understand how they got the rest energies of both the electrons but y did they x it by 1.6x10^-13 were usually from ev to j you times by 1.6x10^-19
Because they must have been converting from MeV to J?

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4. Hey everyone, I know I've already posted this, but quite a few people have been using it today, and I just added a few more bits.
It's probably quite late, but if you want to test out your knowledge (especially on definitions), give this memory "course" I made a try!
http://www.memrise.com/course/83265/as-aqa-physics-a/

And good luck tomorrow everyone; I know I'm bricking it!
5. Try it you have the values on the data sheet, they match

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6. (Original post by x-Sophie-x)
Because they must have been converting from MeV to J?

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ahhhhh thats so confusing !! how you suposto remember that!
7. Good Luck everyone!

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8. (Original post by Micheal123456)
for jan 13 question 2 b i understand how they got the rest energies of both the electrons but y did they x it by 1.6x10^-13 were usually from ev to j you times by 1.6x10^-19
This is because 0.510999 is not in eV. It is in MeV. So, you would get rid of M which x10^6 and then e which 1.6x10-19C. -19+6=-13. so it is 1.6x10^-13C to get into Joules. Clear now?
9. (Original post by Jimmy20002012)
Good Luck everyone!

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Good luck to you to Jimmy!
10. (Original post by reemaisthinking)
Hee hee! .....

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Perhaps....

Are you doing this exam?
11. (Original post by Micheal123456)
ahhhhh thats so confusing !! how you suposto remember that!
You do not have to remember this as you will be given in the exam. You should have 1 with you. Do you have 1?
12. (Original post by Micheal123456)
ahhhhh thats so confusing !! how you suposto remember that!
M is Mega so ten to the power of 6.
-19 plus 6 is -13
Easy

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13. (Original post by Tuya)
Rest energy is rest mass times c squared
E=mc2

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That's not in our spec though, right?

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14. Any last minute help Jimmy? You know what... I am going to college tomorrow at half 7 and will revise u(ntil the exam starts afternoon) with my friends. HAHHAaa
15. (Original post by x-Sophie-x)
That's not in our spec though, right?

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Yes we do not need to know about e=mc^2. Just need to know what it means.
16. Right I've had enough of this for today!

Good luck for Physics tomorrow guys! We'll do great

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17. (Original post by x-Sophie-x)
Right I've had enough of this for today!

Good luck for Physics tomorrow guys! We'll do great

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Good luck to you tooooooooooooooooooooooooooooooo !!!!!!!
18. (Original post by Jimmy20002012)
Good Luck everyone!

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Do you need any last minute help Jimmy?
19. hopping an easy 6 mark question. Will discuss the answers tomorrow guys
20. Good luck everyone!

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