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

3 years ago
#681
(Original post by The Room Student)
Haha, sounds weird I know, but the low grade boundaries just make me feel kinda chilled about it!

There's a load of stuff to learn, but once you've grasped it, most questions are quite friendly I think...
True, sure they're not as low as G482 but it's also easier imo

Posted from TSR Mobile
0
3 years ago
#682

http://www.ocr.org.uk/Images/144793-...of-physics.pdf

Thanks.
0
3 years ago
#683
(Original post by L'Evil Fish)
Yes !!!
Wahey! It's certainly a lot nicer than doing a crammed (and often stupid) lil G484 paper.

This is my last exam too, so once C4 is done with on Tuesday, hopefully things will be looking bright!
0
3 years ago
#684
(Original post by sagar448)

http://www.ocr.org.uk/Images/144793-...of-physics.pdf

Thanks.
since the peak occurs at a lower flux density value, the ions required less force to complete the circle of correct radius to the detector. f = mv^2/r since it says speed is the same, then f dp to mass. so mass must be less since force is less

also the smaller peak for the current means there are significantly less of this isotope since the current is dependant on the amount of ions that strike the detector.
1
3 years ago
#685
(Original post by boristeve)
since the peak occurs at a lower flux density value, the ions required less force to complete the circle of correct radius to the detector. f = mv^2/r since it says speed is the same, then f dp to mass. so mass must be less since force is less

also the smaller peak for the current means there are significantly less of this isotope since the current is dependant on the amount of ions that strike the detector.
OH thank you.
0
3 years ago
#686
(Original post by boristeve)
here you go
Wrong textbook sorry
I meant the Physics 2 for OCR book

Posted from TSR Mobile
0
3 years ago
#687
i just hope it's a normal paper otherwise i don't think i'll get an A. I did pretty crap in g484 i think.
0
3 years ago
#688
(Original post by ETRC)
i just hope it's a normal paper otherwise i don't think i'll get an A. I did pretty crap in g484 i think.
Same bro, I lost like close to 15 marks. People are saying grade boundaries will be low. If they are then I can get A*. If not then I'll have to do soooooo good in G485 to level it out. :C
0
3 years ago
#689
(Original post by sagar448)
Same bro, I lost like close to 15 marks. People are saying grade boundaries will be low. If they are then I can get A*. If not then I'll have to do soooooo good in G485 to level it out. :C
same i lost like 16 marks

i can now only drop like 8 marks to get an A*. I think i have a better chance at a* in further maths instead of physics. i also made 2 stupid mistakes in c3 but i think i got enough for an a* in that.

i did good in chemistry but its my least important subject -.-
0
3 years ago
#690
I'm not sure if this question is correct:

The region of uniform magnetic field is created by the electric current in an arrangement of coils. Suggest how the end of the electron beam is swept up and down the tv screen.

My answer was relating to the magnetic force being Fc and assuming that remains unchanged electron maintains circular path around tv screen

But I'm not sure if it's correct. Is it? If not, what's the right answer?

Posted from TSR Mobile
0
3 years ago
#691
(Original post by ETRC)
same i lost like 16 marks

i can now only drop like 8 marks to get an A*. I think i have a better chance at a* in further maths instead of physics. i also made 2 stupid mistakes in c3 but i think i got enough for an a* in that.

i did good in chemistry but its my least important subject -.-
OCR Core 3? What do you think 90 UMS will be?
0
3 years ago
#692
(Original post by The Room Student)
OCR Core 3? What do you think 90 UMS will be?
i do mei for maths not ocr
0
3 years ago
#693
(Original post by L'Evil Fish)
Yeah the 6.5cm^-1 would go to 650
ohhhhhh thanks
0
3 years ago
#694
(Original post by The Room Student)
Hey everyone. New to the thread. Just curious: is anyone else, in a sick and twisted way, looking forward to this exam?
No. My exams the previous day don't finish until 5pm, so I'm only going to have a couple of hours to revise and will be exhausted for this one. I also estimate I'll need 138 UMS so not looking forward to it. I've got 150 UMS in the last load of papers I've done, but I'm not sure if I can match that in the real thing.
0
3 years ago
#695
how the **** does KE of electrons convert into X-rays as photons?
0
3 years ago
#696
(Original post by ETRC)
i do mei for maths not ocr
For maths I made silly ass mistake even though I found it easy. I did Edexcel exam board and dropped like 10-11 marks. People said it was hard so hopefully Grade boundaries are low.... I will need to go really good in C4 to level it out.. :c
0
3 years ago
#697
(Original post by morgan8002)
No. My exams the previous day don't finish until 5pm, so I'm only going to have a couple of hours to revise and will be exhausted for this one. I also estimate I'll need 138 UMS so not looking forward to it. I've got 150 UMS in the last load of papers I've done, but I'm not sure if I can match that in the real thing.
Ouch. What exams have to got on the Wednesday? I'm guessing that's for an A* overall... well it sounds very high when put like that, but even on relatively easy past papers, around 135 UMS hasn't been too hard to get in terms of percentage raw marks. I'm sure you can do it!
0
3 years ago
#698
(Original post by LilDurk)
how the **** does KE of electrons convert into X-rays as photons?
electrons are released at a large pd at a metal and they collide the the electrons of the atoms. because of the photoelectric effect, some of the ke of electrons is absorbed by the e- on metal and s-ray photons are released.

you just have to know that electrons hit a metal surface with a high pd so some of the ke of electrons is converted to x-ray photons. you might need to know it's the photoelectric effect which causes it.
0
3 years ago
#699
(Original post by LilDurk)
how the **** does KE of electrons convert into X-rays as photons?
when the electron strikes the tungsten anode, it collides with an inner electron in one of the tungsten atoms, causing it to be ejected. When another electron takes it place, it emits a photon to make up the energy difference. The photon emitted is an X Ray
0
3 years ago
#700
(Original post by The Room Student)
Ouch. What exams have to got on the Wednesday? I'm guessing that's for an A* overall... well it sounds very high when put like that, but even on relatively easy past papers, around 135 UMS hasn't been too hard to get in terms of percentage raw marks. I'm sure you can do it!
Biology F215 and STEP II.
Yes for an A*.
I know. On most days I could definitely get that but I'm not sure if I'll get that in the real thing. I'm probably just over worried about it but it's my most important A-level/STEP exam this year.
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

• Cardiff Metropolitan University
Undergraduate Open Day - Llandaff Campus Undergraduate
Sat, 27 Apr '19
• University of East Anglia
Could you inspire the next generation? Find out more about becoming a Primary teacher with UEA… Postgraduate
Sat, 27 Apr '19
• Anglia Ruskin University
Health, Education, Medicine and Social Care; Arts, Humanities and Social Sciences; Business and Law; Science and Engineering Undergraduate
Sat, 27 Apr '19

### Poll

Join the discussion

#### Have you registered to vote?

Yes! (524)
37.59%
No - but I will (109)
7.82%
No - I don't want to (96)
6.89%
No - I can't vote (<18, not in UK, etc) (665)
47.7%