GCSE Edexcel physics - 12th June 2014

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Parallex
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#61
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#61
(Original post by Eradicating)
What about the reasons l why fusion does not need to slow it's neutron down

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Fusion doesn't involve absorption of neutrons - so why would they need to be slowed down? Stray neutrons can be thought of as a kind of 'waste product' during fusion.
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Akashi
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#62
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#62
(Original post by Eradicating)
What about the reasons l why fusion does not need to slow it's neutron down

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Fusion requires its material to meet at high speeds.
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clareeey
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#63
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#63
(Original post by Eradicating)
It was two marks! So do I get a mark for stating it transfers energy?

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You should get at least one
I've attached part of the march 2013 markscheme that had a very similar 2 mark question "explain why the temperature of a resistor increases when a current passes through", so only variation is that our question was about a filament...
It wouldn't let me upload a cropped version...
Attached files
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Marcusroye98
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#64
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#64
(Original post by Parallex)
Fusion doesn't involve absorption of neutrons - so why would they need to be slowed down? Stray neutrons can be thought of as a kind of 'waste product' during fusion.
I just put that no chain reactions occur?
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Eradicating
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#65
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#65
(Original post by Parallex)
Fusion doesn't involve absorption of neutrons - so why would they need to be slowed down? Stray neutrons can be thought of as a kind of 'waste product' during fusion.
Could you say that
As fusion creates a helium nucleus and is the joining of hydrogen nuclei, the main product is the helium and the new neutron cannot be used a reactor again ( such as fast moving neutrons again splitting into uranium nucleus). So basically is useless and is a by product of reaction.

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Parallex
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#66
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#66
(Original post by Eradicating)
Could you say that
As fusion creates a helium nucleus and is the joining of hydrogen nuclei, the main product is the helium and the new neutron cannot be used a reactor again ( such as fast moving neutrons again splitting into uranium nucleus). So basically is useless and is a by product of reaction.

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Probably, although fusion on Earth would probably consist of the deterium-deterium chain rather than the proton-proton chain (hydrogen -> helium like the Sun) but your explanation is still valid.
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Eradicating
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#67
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#67
(Original post by Akashi)
Fusion requires its material to meet at high speeds.
But neutron is a product.

The isotopes of hydrogen do not need neutrons? To join... so how does this affect the material

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Eradicating
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#68
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#68
(Original post by Parallex)
Probably, although fusion on Earth would probably consist of the deterium-deterium chain rather than the proton-proton chain (hydrogen -> helium like the Sun) but your explanation is still valid.
Deterium is an isotope of hydrogen.

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Akashi
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#69
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#69
Is it not enough to say that the reactants must meet at high speeds lol?

Hope that is right.
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Marcusroye98
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#70
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#70
(Original post by Eradicating)
Its 5.33

It was wrong rearranging lol

It was t=v-u/a

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What was the question? i remember getting something .6 recurring for one of the questions..
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Eradicating
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#71
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#71
(Original post by Akashi)
Is it not enough to say that the reactants must meet at high speeds lol?

Hope that is right.
Idk lol I was so confused.

But isotopes don't need neutrons to join, so whether fast/slow the neurons do not affect reaction.

Idk I hope :yy:

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Eradicating
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#72
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#72
So how about the question below the half life?

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Akashi
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#73
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#73
(Original post by Eradicating)
So how about the question below the half life?

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It was 5.2. Parallax agrees too
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Eradicating
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#74
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#74
(Original post by Akashi)
It was 5.2. Parallax agrees too
The other one underneath it.

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Parallex
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#75
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#75
(Original post by Eradicating)
Deterium is an isotope of hydrogen.

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Yes but it's the stable isotope of Hydrogen, which is better to attempt to fuse on Earth than the form of Hydrogen that the Sun uses. That's just background knowledge anyway, no marks even come from that.
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Marcusroye98
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#76
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#76
What did we need to say when it said compare the two isotopes?...
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Eradicating
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#77
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#77
(Original post by Parallex)
Yes but it's the stable isotope of Hydrogen, which is better to attempt to fuse on Earth than the form of Hydrogen that the Sun uses. That's just background knowledge anyway, no marks even come from that.
Would I get a mark if I said that the half life is 5?

Or does it definitely range from 5.2 to 5.4! Oh god:eek:

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Akashi
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#78
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#78
(Original post by Eradicating)
Would I get a mark if I said that the half life is 5?

Or does it definitely range from 5.2 to 5.4! Oh god:eek:

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I don't think the range will be any larger than that.
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Eradicating
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#79
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#79
(Original post by Akashi)
I don't think the range will be any larger than that.
LOL 4 marks gone.

:eek:
What did you get for question that says find 1000bq year? For sommit?

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Akashi
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#80
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#80
(Original post by Eradicating)
LOL 4 marks gone.

:eek:
What did you get for question that says find 1000bq year? For sommit?

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Range, I think, will be 15.8-16.2.
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