OCR Physics B A2 synoptic pre-release discussion

Right after going through the chapters I've listed most of the equations that aren't given in the formula booklet, I'll post them uphere just in case anyone wants to have a look but I just have a query about a few...

Linear magnification (m) = v/u
Power of lens = 1/f
sin C = 1/n
emf = E/Q (Is this a correct equation? And how likely is it to come up as I can't remember using it in AS at all)
F= - GMm/r^2
g= - GM/r^2
As with electric field, does the gravitational potential energy = GMm/r^2?
pV=NkT=nRT
U=3NkT/2
Faraday's law
E=F/Q=V/d
F = KQq/r^2
Electrical field around a point charge = kq/r^2
Electrical potential energy = Kqq/r
W=qV (van de graff accelerator, won't be needing this right?)
De Broglie Wavelength = h/p

Also, I think it might be worth learning some of the less well-known units, so far I've got down...

Conductance - Siemens
Power of Lens - dioptres
Flux - Weber
Flux density - Tesla
Absorbed Dose - Gray
Dose equivalent - Sievert

Any equations or units that you guys think may be worth remembering?

Having looked at everything I'm quite pleased Boltzmann factor will be coming up, it's one of the easier chapters. Just hope they concentrate on A2 chapters.

Reply 82

good post mate, looks fairly useful,

just a quick question on SHM, as im guessin it might come up, when do u have to have ure calculator in Rads and when in degrees, coz i remember not remebering when i did r&f!?

Cheers

Reply 83

mikejones

I see. What are you going to spend the morning before the exam doing then?

I'm not sure, if there's any bits and pieces of past papers I can salvage I might do them, if not I'm thinking sleep :biggrin:

sas88

hey guys,

I know this has already been mentioned, but i have done a few past papers to see what the questions are like and have never seen anything come up that is as hard as those "teacher forum" questions, all the questions regardless of the pre - release topic are going to be on the course, because its a synoptic (and therefore overall course) exam, not an exam totally on like degree level entropy equations that we have never done in class!! Well, thats what im hoping neway!! (otherwise im dead)

Saying that, for all the other years, the pre release has actually been on an "advance in physics" , i.e, a new method to look deeper into space, or a new advance such as a train that runs on magnets, but i dont seem to see what this case study is on about, its more history of steam engines opposed to new advances, really thrown me?

Hit me back and let me know what you think?

Cheers

SAS

Yeah, those teachers questions are just there to give a just of the topics. Never looked at the other pre release material myself so I don't really know what I should have expected so I'm cool with this one, it's relatively simple and easy to understand.

Reply 84

dra2k4

1

It's E = QV/2

And Lambda = h/p is in the formula book

Reply 85

Vnvim

Does anyone have the markscheme for this paper from June 2006?

EDIT: nvm found it

Reply 86

Yeah i know but in comparison its just a bit weird, like before its just been straight forward course related prerelease, this ones a bit weird and initially is harder to pick out relevant course "topics" have to wait and see i guess - suppose they can ask us on anything not on the course or stated in the pre-release ?

Reply 87

Tazman123

Right after going through the chapters I've listed most of the equations that aren't given in the formula booklet, I'll post them uphere just in case anyone wants to have a look but I just have a query about a few...

Linear magnification (m) = v/u
Power of lens = 1/f
sin C = 1/n
F= - GMm/r^2
g= - GM/r^2
As with electric field, does the gravitational potential energy = GMm/r^2?
pV=NkT=nRT
U=3NkT/2
Faraday's law
E=F/Q=V/d
F = KQq/r^2
Electrical field around a point charge = kq/r^2
Electrical potential energy = Kqq/r
W=qV (van de graff accelerator, won't be needing this right?)

Also, I think it might be worth learning some of the less well-known units, so far I've got down...

Conductance - Siemens
Power of Lens - dioptres
Flux - Weber
Flux density - Tesla
Absorbed Dose - Gray
Dose equivalent - Sievert

Any equations or units that you guys think may be worth remembering?

Having looked at everything I'm quite pleased Boltzmann factor will be coming up, it's one of the easier chapters. Just hope they concentrate on A2 chapters.

Edited for accuracy.

Reply 88

how do i convert between:

joules, electron volts, and joules per mole?

:wtf?:

Reply 89

anyone know the answer to my SHM question? :P

erm, i think when its eV -> Joules u multiply by electron charge (opposite if other way round

And Jmol-1 --> Joules per patricle then divide by Avagadro's no, (particles per mole)

think neway mate

Reply 90

Joules/1.6x10^-19 (e) = eV
Joules/moles= J/mol

Reply 91

sas88

anyone know the answer to my SHM question? :P

erm, i think when its eV -> Joules u multiply by electron charge (opposite if other way round

And Jmol-1 --> Joules per patricle then divide by Avagadro's no, (particles per mole)

think neway mate

cheers. Havent got a clue with the SHM question though :redface:

Anyone?

To tazman or anyone else planning on *maybe* going through past papers (lol):
Are you going through section B's from this exam? or actual past papers from other exams?

Reply 92

Section B's, doubt I have the willpower to be doing those other papers. I've got 7 section B's to go through which should see me out till exam time.

Reply 93

tazman? any suggestions with the SHM thing?

Reply 94

ah, sounds reasonable enough.

Anyone got their pre-release handy?

1)how is energy actually produced, in the engingine in figure 1?
2)what is work done in relation to this diagram?
3)is there any theory behind efficiency we need to know?

Reply 95

I have no idea what SMH stands for :biggrin:

Reply 96

mikejones

ah, sounds reasonable enough.

Anyone got their pre-release handy?

1)how is energy actually produced, in the engingine in figure 1?
2)what is work done in relation to this diagram?
3)is there any theory behind efficiency we need to know?

1) Heat is produced which is partly turned into useful work.
2) just the fraction which says 'useful work', are you looking for it in terms of the actual steam engine? I'd guess it would go towards working the engine.
3) Just the equation they've given us.

Reply 97

eguk

some simple harmonic motion stuff i have covered is:

F = kx (spring), E = ½kx²

a = -w²r

T = 2pi (m/k)^½

T = 2pi/w

(sorry if its hard to understand, i couldnt find some of the symbols to use)

are there any other SHM equations worth learning?

also what kind of stuff do we need to know about hubble time?

Reply 98

dra2k4

1

sas88

good post mate, looks fairly useful,

just a quick question on SHM, as im guessin it might come up, when do u have to have ure calculator in Rads and when in degrees, coz i remember not remebering when i did r&f!?

Cheers

It should tell you, I believe.

Reply 99