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PHYA5 ~ 20th June 2013 ~ A2 Physics

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Section A was pretty good and the Medical Option was incredibly easy for once, thought that went better than Unit 4 and C4 :smile:

Reply 1481

Pinkhead

Original post by Jam Jam24

It said what was the source of the radioactive waste products?
So i said Uranium 235 :P

Technically that isn't wrong but I doubt they'd be asking for source of waste products in such a roundabout way as to mean uranium.

Reply 1482

bugsuper

Original post by Pinkhead

Technically that isn't wrong but I doubt they'd be asking for source of waste products in such a roundabout way as to mean uranium.

I agree, but I really want to see the paper now so we can be sure of the wording of the question... jeez, I knew coming on here for a physics post-mortem was a bad idea :P

Reply 1483

George_

I said the fission products of U-235, is that still a valid answer? (For the posing biggest danger from waste question)...

Reply 1484

Jam Jam24

Original post by Beth_L_G

Same haha
I put it so its probably wrong :tongue:

Most ppl have put that, we've probz got it right hopefully :biggrin:

Reply 1485

SpiggyTopes

Original post by Pinkhead

For Unit 5D, my boundary predictions are:
66- 120
60- 108
53- 96
46- 84

I hope it's one mark lower though but it wasn't as hard as last year's so doubt they'd push it down more than that.

Is that marks over the two papers?

Reply 1486

milliezhao

Original post by AWithers95

I got 8.4 as the temperature and 0.016kg - probably rounding differences in here.

I got 8.41 for the temperature and use 8 for the next part and got 0.15, you dont have to use 8.4 for the next part do you?

Reply 1487

IChooseThisName

For the question about what happens to the neutron in an elastic collision, I just said momentum and kinetic energy are conserved. :/

Reply 1488

Jam Jam24

Original post by Pinkhead

Technically that isn't wrong but I doubt they'd be asking for source of waste products in such a roundabout way as to mean uranium.

Only the AQA examiners know what they mean XD

Reply 1489

sports_crazy

What was the density of the gas?
The mass of gas in high altitude was 3.5mol* kgmol^-1

Reply 1490

Beth_L_G

Original post by Jam Jam24

Most ppl have put that, we've probz got it right hopefully :biggrin:

Probably hopefully

Pretty much sums up the marking of aqa papers...

Reply 1491

Hullo

Original post by sports_crazy

What was the density of the gas?
The mass of gas in high altitude was 3.5mol* kgmol^-1

Something like 28.1?

Reply 1492

Jam Jam24

Original post by IChooseThisName

For the question about what happens to the neutron in an elastic collision, I just said momentum and kinetic energy are conserved. :/

That question pissed me off. We learned that moderators slow down neutrons. So how is it elastic?? I just put down what i learned that kinetic energy of the neutrons decreases and gets trannsfered to the moderator atoms but no clue