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

Elcor
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#1781
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#1781
(Original post by trooken)
How do you do the question before that?
The calculation one to calculate current?

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That's what I'm talking about.

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Leechayy
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#1782
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#1782
(Original post by Faggy)
the increase in temp is due to 99% of electrons energy converted to heat 1% is converted to X ray photons.
So will I lose 1 out of the 4 marks then?

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Wing:)
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#1783
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#1783
(Original post by KT_T)
Same I definitely should have prioritised this exam, even questions I thought were OK I know I've got wrong thanks to talking to everyone afterwards... All in all thought it was a tricky paper, definitely screwed up uni lol
Medical imaging was alright because I could learn for it. All the calculations were horrible
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jcwh97
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#1784
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#1784
(Original post by kate8)
Was the strong nuclear question attractive or repulsive?

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I think it was repulsive because the s.force is repulsive at very short distances and I think it stated distances shorter than in biii

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BrokenS0ulz
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#1785
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#1785
(Original post by Elcor)
Yeah

Power stored in capacitor each time is 0.5CV^2
This is discharged into the resistor equal to I^2R
It discharges over 1 time period (this assumption might be wrong)
Then use P=E/t and equate the top two lines and rearrange for I.

So I got an equation with I^2 being proportional to f, so my logic for the next bit was to say 'I is proportional to root f, so I would increase by a factor of root 2, not 2'.
I did exactly the same for both questions
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Faggy
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#1786
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#1786
(Original post by Leechayy)
So will I lose 1 out of the 4 marks then?

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youll get 2/4
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Damhuis95
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#1787
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#1787
(Original post by IAmYourdog)
The paper is here for you guys!
Was in a rush to get pictures but you can see most of the text on the paper.
https://onedrive.live.com/redir?resi...hint=folder%2c
Is that satellite question in there by accident?!
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trooken
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#1788
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#1788
(Original post by Elcor)
That's what I'm talking about.

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I can't get 1.8x10^(-3) though
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Elcor
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#1789
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#1789
(Original post by trooken)
I can't get 1.8x10^(-3) though
Post a picture of your working
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IAmYourdog
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#1790
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#1790
(Original post by Damhuis95)
Is that satellite question in there by accident?!
No that was the last question remember



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joking... I guess I added it in by accident
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trooken
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#1791
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#1791
(Original post by Elcor)
Post a picture of your working
Don't worry
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Damhuis95
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#1792
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#1792
(Original post by IAmYourdog)
No that was the last question remember


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joking... I guess I added it in by accident
Omg ahahahahah I just got up to walk out of my office at work before seeing the spoiler!!!
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Raizel
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#1793
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#1793
Don't know if works because dont remember exactly my answer.
The current question. I done Q=IT and Q=CV, where T=1/f, so CV/(1/120)
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SkilledNChilled
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#1794
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#1794
Mark scheme up yet lads?
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Jim997
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#1795
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#1795
(Original post by Raizel)
Don't know if works because dont remember exactly my answer.
The current question. I done Q=IT and Q=CV, where T=1/f, so CV/(1/120)
This is exactly what I did. Why is it wrong?
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rachelc142
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#1796
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#1796
teachercol pls where are you :-(

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Oraeng
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#1797
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#1797
Looks like I lost about 15 marks - happy with that
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teachercol
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#1798
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#1798
(Original post by Chung224)
Does anyone know if teachercoll is making an unofficial marlscheme?
Its out. Enjoy
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teachercol
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#1799
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#1799
(Original post by rachelc142)
teachercol pls where are you :-(

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Scarborough
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trooken
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#1800
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#1800
(Original post by Jim997)
This is exactly what I did. Why is it wrong?
No idea. In my head, both the energy and charge method should work, but they give different answers. The charge method is probably incorrect, as the working was short for 3 marks, but don't know why
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