PHYA5 ~ 20th June 2013 ~ A2 Physics

Reply 1520

Pinkhead

14

Original post by Hullo

Ideal gas with molecules which are identical, no intermolecular forces, negligible volume and random motion :confused:

That's what I wrote but Bugsuper has destroyed my hopes of getting that right :frown:

Reply 1521

cooldudeman

18

Original post by Pinkhead

Yeah I used my point P as a guide.

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Reply 1522

SpiggyTopes

14

Original post by Kenna

What did people get for the energy release on the 1st question? I think mine was around 230 Mev.... can't remember exactly.

I think I got about twenty something. :s-smilie:

Reply 1523

mrwho

Original post by Little Wing

You're right, they were talking about the spent fuel rods i.e the neutron rich daughter nuclei, saying fuel rods doesn't mean anything.

I hope you're right... I also talked about Thorium; is that the major decay product of uranium? I got that from somewhere in my head but I've no idea if it's right.

Either way the question was worded poorly, given that a lot of people said spent fuel rods and a lot went for the actual nuceli.

Reply 1524

des1001

what did people doing applied get for the angular deaccalearon? 0.785? and the new temprature of the gas before the long 6 marker at the end, 931 or something?

Reply 1525

Snakefingers13

I thought the paper was quite straightforward compared to the older ones, turning points especially wasn't too difficult. I'd expect boundaries similar to June 2010.

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Reply 1526

Christd

Original post by Pinkhead

At least i got something right haha! Thanks

Reply 1527

Kenna

My graph went through the point at roughly 0.87c ish and 2mo. Then was asymptotic to 1c.

My mass of ice was 0.015kg with the prove the temperature at 8.41.

Could not prove the charge on the droplet was 1.6x10-19?! Kept getting 2.5x10-19 wtf....

Trying to remember other answers. :wink:

Reply 1528

milliezhao

I said idea gas obeys pv=nrt, and say what each of the letters mean, do you think i will get the marks?

Reply 1529

milliezhao

Original post by des1001

what did people doing applied get for the angular deaccalearon? 0.785? and the new temprature of the gas before the long 6 marker at the end, 931 or something?

Yes i got something like that too!

Reply 1530

Bobilina

12

Original post by Hullo

Ideal gas with molecules which are identical, no intermolecular forces, negligible volume and random motion :confused:

I said something along these lines also.

Reply 1531

Jam Jam24

8

Original post by TerminatorFive

I got like 27 or something, so youre probably fight :P

So annoying cant remember what i put argh! But wasnt it something like:
4.something - 4. something... then X by 931? :smile:

Reply 1532

Kenna

Original post by TerminatorFive

I got like 27 or something, so youre probably fight :P

Wait could have got that.... can't remember! haha

Reply 1533

#Bi-Winning

Original post by josephtsui

I got around 24.7 for the MeV question. Yeh you have include the positrons.

I personally don't think so, I neglected the mass of the positrons and still got 24.7 MeV, their mass is tiny and I'm pretty sure they're not given in the table of fundamental values, either way the answer is 24.7 if you take into account the mass of the positrons or not I guess?

Reply 1534

Lay-Z

20

Original post by Kenna

My graph went through the point at roughly 0.87c ish and 2mo. Then was asymptotic to 1c.

My mass of ice was 0.015kg with the prove the temperature at 8.41.

Could not prove the charge on the droplet was 1.6x10-19?! Kept getting 2.5x10-19 wtf....

Trying to remember other answers. :wink:

Same, I just said its quantsised so it has to be a multiple of 1.6x10^-19 and its the closest multiple

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Reply 1535

Pinkhead

14

Original post by Kenna

My graph went through the point at roughly 0.87c ish and 2mo. Then was asymptotic to 1c.

My mass of ice was 0.015kg with the prove the temperature at 8.41.

Could not prove the charge on the droplet was 1.6x10-19?! Kept getting 2.5x10-19 wtf....

Trying to remember other answers. :wink:

I got the charge one wrong as well but figured it out after I left the exam hall..
It's because in the previous question the answer was 3.something x10^-19 and any value below this would have to be 1.6x10^-19 since charges on a droplet are quantised.

Reply 1536

cooldudeman

18

Original post by Kenna

My graph went through the point at roughly 0.87c ish and 2mo. Then was asymptotic to 1c.

My mass of ice was 0.015kg with the prove the temperature at 8.41.

Could not prove the charge on the droplet was 1.6x10-19?! Kept getting 2.5x10-19 wtf....

Trying to remember other answers. :wink:

Yeah 0.87c. That means we got the part before right too.

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Reply 1537

Katherineelb

Original post by mrwho

How is that 'elastic'? I said that because I had no idea, but it goes explicitly against what was stated in the question.

I think it's because Ek is conserved and the moderator atoms are stationary so the Ek is shared between the two , therefore slowing neutrons down as they're Ek is lower than before

Reply 1538

cooldudeman

18

What equation did you lit use for the last part of q4? In sec A

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Reply 1539

SpiggyTopes

14

Original post by #Bi-Winning

I personally don't think so, I neglected the mass of the positrons and still got 24.7 MeV, their mass is tiny and I'm pretty sure they're not given in the table of fundamental values, either way the answer is 24.7 if you take into account the mass of the positrons or not I guess?

The mass of a positron is the same as the mass of an electron I think, which is given in the table.

PHYA5 ~ 20th June 2013 ~ A2 Physics

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