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

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

Posted from TSR Mobile

Posted from TSR Mobile
0
3 years ago
#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?

Posted from TSR Mobile
0
3 years ago
#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
0
3 years ago
#1784
(Original post by kate8)
Was the strong nuclear question attractive or repulsive?

Posted from TSR Mobile
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

Posted from TSR Mobile
0
3 years ago
#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
0
3 years ago
#1786
(Original post by Leechayy)
So will I lose 1 out of the 4 marks then?

Posted from TSR Mobile
youll get 2/4
0
3 years ago
#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?!
0
3 years ago
#1788
(Original post by Elcor)

Posted from TSR Mobile
I can't get 1.8x10^(-3) though
0
3 years ago
#1789
(Original post by trooken)
I can't get 1.8x10^(-3) though
Post a picture of your working
0
3 years ago
#1790
(Original post by Damhuis95)
Is that satellite question in there by accident?!
No that was the last question remember

Spoiler:
Show
joking... I guess I added it in by accident
0
3 years ago
#1791
(Original post by Elcor)
Post a picture of your working
Don't worry
0
3 years ago
#1792
(Original post by IAmYourdog)
No that was the last question remember

Spoiler:
Show
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!!!
0
3 years ago
#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)
0
3 years ago
#1794
0
3 years ago
#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?
0
3 years ago
#1796
teachercol pls where are you :-(

Posted from TSR Mobile
0
3 years ago
#1797
Looks like I lost about 15 marks - happy with that
0
3 years ago
#1798
(Original post by Chung224)
Does anyone know if teachercoll is making an unofficial marlscheme?
Its out. Enjoy
1
3 years ago
#1799
(Original post by rachelc142)
teachercol pls where are you :-(

Posted from TSR Mobile
Scarborough
1
3 years ago
#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
0
X

new posts
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Brunel University London
Wed, 22 May '19
• University of Roehampton
Wed, 22 May '19
• Sheffield Hallam University
Wed, 22 May '19

### Poll

Join the discussion

#### How did your Edexcel GCSE Maths Paper 1 go?

Loved the paper - feeling positive (515)
26.25%
The paper was reasonable (856)
43.63%
Not feeling great about that exam (383)
19.52%
It was TERRIBLE (208)
10.6%