AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread]

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Does that mark scheme allow for other answers? It depends on what the MS actually says. "Any sensible answer" is sometimes included.

That said, because it said "in the atmosphere", it makes me think of a particular element/compound in the atmosphere, over physical entities such as clouds.

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Water (vapour) [or carbon dioxide]

Reply 941

CD223

Original post by JaySP

Water (vapour) [or carbon dioxide]

I guess you'll just have to accept that's all it was looking for. From the sounds of it they won't accept anything else.

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Reply 942

JaySP

But would they accept the answer:

"Water vapour, pollution cloud coverage"

Ie would I get the mark, despite giving wrong answers with it?

Reply 943

Lau14

Original post by CD223

I'm trying not to rely too heavily on the week between exams :L

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I need to get going this week yeah, but my week of exams after half term are three of my easiest at least

Reply 944

CD223

Original post by JaySP

But would they accept the answer:

"Water vapour, pollution cloud coverage"

Ie would I get the mark, despite giving wrong answers with it?

I don't think so, as AQA don't credit students that give multiple answers with most incorrect even if one is correct.

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Reply 945

CD223

Original post by Lau14

I need to get going this week yeah, but my week of exams after half term are three of my easiest at least

That's good. My exams are mainly in the second week after half term :smile:

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Reply 946

Lau14

Original post by CD223

That's good. My exams are mainly in the second week after half term :smile:

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My exams are three a week for three weeks and then M2 all by itself :smile:

Reply 947

CD223

Original post by Lau14

My exams are three a week for three weeks and then M2 all by itself :smile:

Ah that's more than me :wink:

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Reply 948

CD223

Does anyone know when you do and don't you take into account the mass of a particle/atom when considering binding energy? Is it when they're on their own? Ie: 1 electron/neutron/proton?

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Reply 949

Lau14

Original post by CD223

I think so? Seeing as a particle on its own can't have binding energy... definitely need to revise that bit though!

Reply 950

CD223

Original post by Lau14

I think so? Seeing as a particle on its own can't have binding energy... definitely need to revise that bit though!

Yeah I just wondered.

In calculations though, like in June 2014 Q1(b), 2 neutrons are produced but you don't consider their mass?

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Reply 951

Ilovemaths96

would they ever ask us to derive the kinetic theory equation? Thanks
ps it is mentioned in the spec

Reply 952

CD223

Original post by Ilovemaths96

would they ever ask us to derive the kinetic theory equation? Thanks
ps it is mentioned in the spec

Yeah they could do. It's in the revision guide, spec and textbook :smile:

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Reply 953

Ilovemaths96

Original post by CD223

Yeah they could do. It's in the revision guide, spec and textbook :smile:

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was hoping for a different answer haha, thanks, i guess i should learn that now :smile:

Reply 954

CD223

Original post by Ilovemaths96

was hoping for a different answer haha, thanks, i guess i should learn that now :smile:

Yeah its frustrating. How do you plan on learning it? I'm still not 100% sure on it from memory - all I know is that you have to derive the force as rate of change of momentum, then pressure as force per unit area, then define the rms speed in all three directions?

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