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

kate8
Badges: 2
Rep:
?
#1761
Report 3 years ago
#1761
Was the strong nuclear question attractive or repulsive?

Posted from TSR Mobile
0
reply
Leechayy
Badges: 11
Rep:
?
#1762
Report 3 years ago
#1762
How many marks could you potentially drop to get an A?

Posted from TSR Mobile
0
reply
IAmYourdog
Badges: 19
Rep:
?
#1763
Report 3 years ago
#1763
POLL ADDED!!
http://www.thestudentroom.co.uk/show....php?t=3411815
0
reply
Faggy
Badges: 0
Rep:
?
#1764
Report 3 years ago
#1764
(Original post by Leechayy)
How many marks could you potentially drop to get an A?

Posted from TSR Mobile
30 marks
0
reply
gothmog827
Badges: 2
Rep:
?
#1765
Report 3 years ago
#1765
(Original post by Elcor)
Nice, same
Do you remember how you got there?

Posted from TSR Mobile
0
reply
IAmYourdog
Badges: 19
Rep:
?
#1766
Report 3 years ago
#1766
(Original post by Leechayy)
How many marks could you potentially drop to get an A?

Posted from TSR Mobile
To be safe 23!
0
reply
hassyrocks
Badges: 3
Rep:
?
#1767
Report 3 years ago
#1767
Haven't seen A star in my life lol, and this paper again,,,,only can hope for a C atleast !


Posted from TSR Mobile
0
reply
Faggy
Badges: 0
Rep:
?
#1768
Report 3 years ago
#1768
(Original post by kate8)
Was the strong nuclear question attractive or repulsive?

Posted from TSR Mobile
attractive
0
reply
hassyrocks
Badges: 3
Rep:
?
#1769
Report 3 years ago
#1769
Really, bad day having dental pain for about 4 days no appointments given! **** up my exams and future biology which I could have done better didn't help me ! Failed physics today " I hate it ! Life is unfair! So sad and bored, worried about my future" taking 12 antibiotics a day for physics exam and nothing came from ultrasound and MRI which was the only thing I revised on an emergency bed ! 50 marks gone '


Posted from TSR Mobile
0
reply
Leechayy
Badges: 11
Rep:
?
#1770
Report 3 years ago
#1770
(Original post by IAmYourdog)
To be safe 23!
I could scrape it then but I'm just worried about mistakes in longer writing questions and calculations.

Are they relatively generous for ecf marks and if it's a minor error, will you not lose all of the marks?

Sorry about the questioning

Posted from TSR Mobile
0
reply
Elcor
Badges: 13
Rep:
?
#1771
Report 3 years ago
#1771
(Original post by gothmog827)
Do you remember how you got there?

Posted from TSR Mobile
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'.
0
reply
Elm Tree
Badges: 13
Rep:
?
#1772
Report 3 years ago
#1772
(Original post by kate8)
Was the strong nuclear question attractive or repulsive?

Posted from TSR Mobile
I wrote both depending on the distance. (In more detail, ofcource)
0
reply
IAmYourdog
Badges: 19
Rep:
?
#1773
Report 3 years ago
#1773
(Original post by Leechayy)
I could scrape it then but I'm just worried about mistakes in longer writing questions and calculations.

Are they relatively generous for ecf marks and if it's a minor error, will you not lose all of the marks?

Sorry about the questioning

Posted from TSR Mobile
I'm not sure there were any questions in that exam that required you to use your answer from a previous part ( correct me if im wrong ) - eg if it asked you to calculate the wavelength in part ai) then in part aiii) it asked you to calculate the energy of the wavelegnth. You would get the ECF mark. - But I don't think there was any like this?

For the writting questions I don't think you would get any ECF marks in this paper.
If for instance in that rate of temp thing you x your energy by 0.001 right at the beginning you would ONLY get the method marks. You wouldn't get the Answer mark. - But I'm not an OCR examiner and nor do I know how lenient the mark scheme will be this year, but I do belive that has generally how marks have been awarded in the past.
0
reply
rachelc142
Badges: 11
Rep:
?
#1774
Report 3 years ago
#1774
(Original post by Terry Tibbs)
I remember on the tour before the interview someone said they'll probably let you off with one A*. They give offers to 80% of applicants which is quite high compared to other good Unis so it doesn't seem like they're that strict.
I remember them saying that too but I do still worry; I also remember them saying about 30% of their intake have 3 A*s!
I guess cos exams have been harder this year there will be more people in our position

Posted from TSR Mobile
0
reply
IAmYourdog
Badges: 19
Rep:
?
#1775
Report 3 years ago
#1775
0
reply
trooken
Badges: 2
Rep:
?
#1776
Report 3 years ago
#1776
(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'.
How do you do the question before that?
The calculation one to calculate current?

Posted from TSR Mobile
0
reply
Leechayy
Badges: 11
Rep:
?
#1777
Report 3 years ago
#1777
(Original post by IAmYourdog)
I'm not sure there were any questions in that exam that required you to use your answer from a previous part ( correct me if im wrong ) - eg if it asked you to calculate the wavelength in part ai) then in part aiii) it asked you to calculate the energy of the wavelegnth. You would get the ECF mark. - But I don't think there was any like this?

For the writting questions I don't think you would get any ECF marks in this paper.
If for instance in that rate of temp thing you x your energy by 0.001 right at the beginning you would ONLY get the method marks. You wouldn't get the Answer mark. - But I'm not an OCR examiner and nor do I know how lenient the mark scheme will be this year, but I do belive that has generally how marks have been awarded in the past.
Ohhh, okay.
I guess that makes sense.

For the increase in temperature, why don't you multiply by 0.01? Isn't it the energy of the x-ray photons?

Ironically, I crossed out the 0.99 one since the change in temperature was too high.
It'd make more sense if the temperature change was only 6℃ initially.

Posted from TSR Mobile
0
reply
dijam
Badges: 2
Rep:
?
#1778
Report 3 years ago
#1778
anyone have any idea when the markscheme is coming out?
0
reply
IAmYourdog
Badges: 19
Rep:
?
#1779
Report 3 years ago
#1779
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
2
reply
Faggy
Badges: 0
Rep:
?
#1780
Report 3 years ago
#1780
(Original post by Leechayy)
Ohhh, okay.
I guess that makes sense.

For the increase in temperature, why don't you multiply by 0.01? Isn't it the energy of the x-ray photons?

Ironically, I crossed out the 0.99 one since the change in temperature was too high.
It'd make more sense if the temperature change was only 6℃ initially.

Posted from TSR Mobile
the increase in temp is due to 99% of electrons energy converted to heat 1% is converted to X ray photons.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Latest
My Feed

See more of what you like on
The Student Room

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

Personalise

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (443)
37.86%
No - but I will (88)
7.52%
No - I don't want to (80)
6.84%
No - I can't vote (<18, not in UK, etc) (559)
47.78%

Watched Threads

View All