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# Edexcel P3 Physics Exam *Unofficial Mark Scheme* 24th June 2016 watch

1. (Original post by vik_k1)
I got that!

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yeah, i remember 10 to the power of 13 +- 10 to the power of 27, so yeah i got this too.
2. (Original post by Liv123456789)
I think I got that too for the velocity question or something. At first, my calculator kept saying maths error because the numbers were too big to square root at the same time, so I had to square root the answer separately.
Yeah, for the velocity i think when v=p/m. But i also remember doing 0.2/0.42 because the momentum was 0.2 and masses together were 0.42?
3. (Original post by XherdanXhaka)
Yeah, for the velocity i think when v=p/m. But i also remember doing 0.2/0.42 because the momentum was 0.2 and masses together were 0.42?
i got 0.2m/s for the velocity is that right?
4. (Original post by TSR778899)
i got 0.2m/s for the velocity is that right?
I think I got around that but didn't round it like you so it was a decimal
5. (Original post by Heardmanator)
I think I got around that but didn't round it like you so it was a decimal
Also was the speed of gamma rays produced 3.0x10^8 ?
6. (Original post by TSR778899)
Also was the speed of gamma rays produced 3.0x10^8 ?
That's what I put
7. (Original post by Ninestars)
I got like 22,200 W/m^2
It was in mW, so you had to divide by a million. That left me with 22.22... W/m^2
8. (Original post by Heardmanator)
That's what I put
was that rounded to 3 and how did you work it out again?
9. (Original post by XherdanXhaka)
was that rounded to 3 and how did you work it out again?
No, it was just the speed of light
10. (Original post by Heardmanator)
No, it was just the speed of light
oh that 1 marker on the top of the page? FFS i put 0 as i thought momentum conserved etc...
11. (Original post by XherdanXhaka)
oh that 1 marker on the top of the page? FFS i put 0 as i thought momentum conserved etc...
Don't sweat it! It's just a 1 marker :-)
12. (Original post by Heardmanator)
Don't sweat it! It's just a 1 marker :-)
1 marker there, there, everywhere man. they're important when so many silly mistakes made. Rough grade boundaries? 48/60 A*?
13. (Original post by XherdanXhaka)
1 marker there, there, everywhere man. they're important when so many silly mistakes made. Rough grade boundaries? 48/60 A*?
I bloody hope so. Around 50 for each would be brill
14. (Original post by Heardmanator)
I bloody hope so. Around 50 for each would be brill
I hope it is 40 for A* but obviously not lol. I think it will be a bit lower than last years though.
15. (Original post by XherdanXhaka)
I hope it is 40 for A* but obviously not lol. I think it will be a bit lower than last years though.
40 would be really nice, but unlikely😩

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16. (Original post by XherdanXhaka)
Yeah, for the velocity i think when v=p/m. But i also remember doing 0.2/0.42 because the momentum was 0.2 and masses together were 0.42?
wasn't the momentum just 0.1?
because the M1 was 0.1 and M2 was stationary so it had 0 velocity x 0.21kg so 0 momentum so the overall momentum had to be 0.1? idk heh
17. I thought both cars were moving towards each other.??
18. (Original post by SophFlorence)
It was in mW, so you had to divide by a million. That left me with 22.22... W/m^2
For milliwatts to watts you divide 1000
For watts to megawatts you times by a 1,000,000

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