OCR Physics A G485 - Frontiers of Physics - 18th June 2015 Watch

fernmaddison
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#201
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#201
(Original post by sagar448)
I'm quite sure that you don't need to remember the timing but you do need to know something like this:

- At the start is was very hot and dense
-All forces were united
-expansion led to cooling
-quarks and leptons (soup)
-more matter than antimatter
-quarks combine to form hadrons
-atoms form
-eventually cools to 3k.

This is very general but this is the type of information you need to know.

Please rep if you like the answer.

Thankyou!!!
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Absent Agent
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(Original post by randlemcmurphy)
Any chance anybody could help me with all of Question 4, please?
http://fizx.wdfiles.com/local--files...%202824%29.pdf

The markscheme doesn't make sense to me, I can't visualize it.
That paper is completely solid. That's not the mark scheme for it


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a123a
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#203
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(Original post by Mehrdad jafari)
That paper is completely solid. That's not the mark scheme for it


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That is the mark scheme for all units. Just scroll down to the 2824 section.
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Absent Agent
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(Original post by a123a)
That is the mark scheme for all units. Just scroll down to the 2824 section.
Oh right, thanks. Now it makes sense. I'm actually doing AQA and so we didn't study about capacitors in parallel or in series


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Absent Agent
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#205
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#205
(Original post by randlemcmurphy)
Any chance anybody could help me with all of Question 4, please?
http://fizx.wdfiles.com/local--files...%202824%29.pdf

The markscheme doesn't make sense to me, I can't visualize it.
To be honest that circuit question is absolutely solid and the explanations of the questions are far more complicated than simply stated on the mark scheme. For example when the capacitor is initially charging the reading on A1 is zero. The mark scheme simply says because the voltage zero. We already know that when current is zero then voltage must be zero without any explanation. In fact the reading on A1 would not be zero if the terminals of the batteries were to be reversed because in that case the electron flow would be in clockwise direction and so some of the electrons drawn from the bottom plate of the capacitor could be pulled back towards the upper plate of the capacitor through the 2k ohm resistor, resulting in a flow of current and a reading on A1.
In the question if A1 is zero when the capacitor is charging it's because the electron flow is in anti clockwise direction and so electrons drawn from the upper plate of the capacitor can only flow in one direction through the 4k ohm resistor and cannot flow through the 2k ohm resistor because the circuit would be incomplete.
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[email protected]
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#206
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#206
Anyone have any good revision videos on this topic?
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Username13
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What is the significance of microwave background radiation at 2.7K?

Is it just so that it shows the universe has cooled down and expanded?
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[email protected]
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(Original post by Username13)
What is the significance of microwave background radiation at 2.7K?

Is it just so that it shows the universe has cooled down and expanded?
I think it is just saying it is the same temp everywhere on average
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L'Evil Fish
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#209
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#209
Did my first past paper

Woooooo

It isn't too bad at all
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Mr_Cupcakes
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(Original post by L'Evil Fish)
Did my first past paper

Woooooo

It isn't too bad at all
How did it go?
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L'Evil Fish
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(Original post by Mr_Cupcakes)
How did it go?
Did June 11, grade boundaries are so low so I did nicely

I hope they stay like that
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Mr_Cupcakes
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(Original post by L'Evil Fish)
Did June 11, grade boundaries are so low so I did nicely

I hope they stay like that
Nice! It is quite a challenging paper so I can understand why they are low. The amount of tedious detail needed for the long answer questions is rather annoying but hey ho could be worse
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L'Evil Fish
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(Original post by Mr_Cupcakes)
Nice! It is quite a challenging paper so I can understand why they are low. The amount of tedious detail needed for the long answer questions is rather annoying but hey ho could be worse
I didn't think they wanted that much detail tbh thought it was fair

I think they're getting worse though now from what I hear

Will see for myself soon
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Elcor
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#214
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#214
Anyone know if you're penalised for giving more points than they've asked you to? For example giving 4 answers to this http://gyazo.com/61b9e707738f472ff35096619cd39d33

I know mark schemes say 'any three from:' for example, but not sure if that means you can say as many as you want
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L'Evil Fish
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(Original post by Elcor)
Anyone know if you're penalised for giving more points than they've asked you to? For example giving 4 answers to this http://gyazo.com/61b9e707738f472ff35096619cd39d33

I know mark schemes say 'any three from:' for example, but not sure if that means you can say as many as you want
You can give as many as you want

They mark first 3 however but if one is neither right nor wrong and you have a correct response as a fourth or something, you can still get the 3 marks I think

However if you write 4 things, 3 right and 1 not right, you'll get 2 marks max

So basically you wouldn't be penalised

I'd write them in order of confidence
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Elcor
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(Original post by L'Evil Fish)
You can give as many as you want

They mark first 3 however but if one is neither right nor wrong and you have a correct response as a fourth or something, you can still get the 3 marks I think

However if you write 4 things, 3 right and 1 not right, you'll get 2 marks max

So basically you wouldn't be penalised

I'd write them in order of confidence
Alright I'll stick to 3 to be safe then. Also well done on 57k lol.
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L'Evil Fish
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(Original post by Elcor)
Alright I'll stick to 3 to be safe then. Also well done on 57k lol.
Yeah I probably would too

Oh Christ haha, I might as well embrace it
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Ki Yung Na
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#218
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Anyone else here think the Strong Nuclear Force is epic?
I look forward to learning more about it using the maths!
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[email protected]
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#219
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#219
Is there a G484 chat?
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BecauseFP
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#220
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So, does anyone know for sure what we need to know about Mass Spectrometers?
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