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

L'Evil Fish
Badges: 18
Rep:
?
#601
Report Thread starter 3 years ago
#601
(Original post by a123a)
Same! I know I didn't even think about resonance as it said amplitude was constant. But I'm guessing I misread it. I would say this paper was similar to last years paper in difficultly. So I'm guessing similar grade boundaries.
Yeah exactly same as me.

We did last year's paper as a mock in January, and I got an A* without doing stuff for it, so I think this paper was dodgier just because of first and second questions.
0
reply
a123a
Badges: 12
Rep:
?
#602
Report 3 years ago
#602
(Original post by L'Evil Fish)
Yeah exactly same as me.

We did last year's paper as a mock in January, and I got an A* without doing stuff for it, so I think this paper was dodgier just because of first and second questions.
Yeah exactly.
0
reply
sagar448
Badges: 2
Rep:
?
#603
Report 3 years ago
#603
Had so many exams, forgotten a lot of G485, anyone know an easier way to just remember everything again?
0
reply
L'Evil Fish
Badges: 18
Rep:
?
#604
Report Thread starter 3 years ago
#604
(Original post by sagar448)
Had so many exams, forgotten a lot of G485, anyone know an easier way to just remember everything again?
Just do a paper
0
reply
Username13
Badges: 8
Rep:
?
#605
Report 3 years ago
#605
Whats the significance of CMBR being at 2.7K?
0
reply
Red Fox
Badges: 11
Rep:
?
#606
Report 3 years ago
#606
Lol I'm so ****ed for this. I need 140+ UMS too.
0
reply
Engineering Lad
Badges: 4
Rep:
?
#607
Report 3 years ago
#607
(Original post by Username13)
Whats the significance of CMBR being at 2.7K?
It's evidence of the Big Bang, because the temperature corresponds to the 2.7K predicted by the Big Bang model and the cooling of the universe to this temperature would suggest an expansion over billions of years.
2
reply
Chung224
Badges: 13
Rep:
?
#608
Report 3 years ago
#608
yes boys.... i gotta get 135/150 to secure my A grade... Anyone got some suggestions
0
reply
sagar448
Badges: 2
Rep:
?
#609
Report 3 years ago
#609
(Original post by L'Evil Fish)
Just do a paper
Oisee, yes thanks. :3
0
reply
LilDurk
Badges: 2
Rep:
?
#610
Report 3 years ago
#610
Does the stability of a nucleus just depend on the relative numberof neutrons and protons? Cheers.
0
reply
Chung224
Badges: 13
Rep:
?
#611
Report 3 years ago
#611
(Original post by LilDurk)
Does the stability of a nucleus just depend on the relative numberof neutrons and protons? Cheers.
no.. good question though if you look at the fission/fusion graph the binding energy will increase up to iron but then decrease past iron, i'm suggesting it has something to do with the electron configuration of elements maybe? either way that's a pretty saucy question if they were gonna ask that.
0
reply
seizetoday
Badges: 12
Rep:
?
#612
Report 3 years ago
#612
Hello people. Hope you are all well.

My question is this:

Why does the force act at right angles to the velocity of the electron in a uniform field? I get that F=Bev but why does it go in a circular path why
thanks
0
reply
seizetoday
Badges: 12
Rep:
?
#613
Report 3 years ago
#613
(Original post by sagar448)
Had so many exams, forgotten a lot of G485, anyone know an easier way to just remember everything again?
same((((((((
0
reply
sagar448
Badges: 2
Rep:
?
#614
Report 3 years ago
#614
It would be great if someone could help me with June 2013 Q6cii

Thanks.
0
reply
L'Evil Fish
Badges: 18
Rep:
?
#615
Report Thread starter 3 years ago
#615
(Original post by Chung224)
no.. good question though if you look at the fission/fusion graph the binding energy will increase up to iron but then decrease past iron, i'm suggesting it has something to do with the electron configuration of elements maybe? either way that's a pretty saucy question if they were gonna ask that.
Pretty sure it does?
0
reply
Chung224
Badges: 13
Rep:
?
#616
Report 3 years ago
#616
(Original post by L'Evil Fish)
Pretty sure it does?
could you explain?
0
reply
kate8
Badges: 2
Rep:
?
#617
Report 3 years ago
#617
(Original post by Chung224)
no.. good question though if you look at the fission/fusion graph the binding energy will increase up to iron but then decrease past iron, i'm suggesting it has something to do with the electron configuration of elements maybe? either way that's a pretty saucy question if they were gonna ask that.
I was told that iron has the ideal ratio of neutrons to protons for the strong nuclear forces to act and so is therefore the most stable. Don't know if thats right or not tho
0
reply
Engineering Lad
Badges: 4
Rep:
?
#618
Report 3 years ago
#618
(Original post by seizetoday)
Hello people. Hope you are all well.

My question is this:

Why does the force act at right angles to the velocity of the electron in a uniform field? I get that F=Bev but why does it go in a circular path why
thanks
The direction of the force on electrons as they move through a magnetic field is given by Fleming's left hand rule. By virtue of this, when a charged particle enters a uniform magnetic field at a right angle, the constant force (F=BQv) applied to the charged particle is always perpendicular to the particle's motion (and the field direction). Since the electromagnetic force, BQv, is perpendicular to the motion, it is effectively a centripetal force and it does no work on the particle. It only causes centripetal acceleration v^2/r, which results in the particle describing a circular path.
0
reply
L'Evil Fish
Badges: 18
Rep:
?
#619
Report Thread starter 3 years ago
#619
(Original post by Chung224)
could you explain?
I thought if a nucleus is too proton or neutron rich, it decays, and releases the relevant ****

So an alpha particle or beta particle
0
reply
sagar448
Badges: 2
Rep:
?
#620
Report 3 years ago
#620
It would be great if someone could help me with June 2013 Q6cii
Thanks.
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! (129)
38.62%
No - but I will (19)
5.69%
No - I don't want to (25)
7.49%
No - I can't vote (<18, not in UK, etc) (161)
48.2%

Watched Threads

View All