Physics Aftermath

Carsinian Thau

So, what did everyone think? Personally I found it very hard and I regret not doing Q12.

mp3guy

Found it to be complete bollocks, ridiculously hard paper.

Feyy

mate just txt me, his words:
"oh **** it might be a fail"

Sounds like Physics was crazy hard this year

Turnip2000

Didnt think it was ridiculous now tbh. Q5 was beautiful..same goes for 10a and 11. I messed up the apparent business in he experiments and I could only get 1 part of Q12.

Overall im quite happy concidering I went into that room dreading The Great Big F i was possibly getting.

Nehpets

****

sternn

I liked it!! What was with the copper piece in the experiment, put me off slightly but i think i got around it.
Also, that question on the dopple effect, messed up on that. Other than that, it was ok. Looking at a high C / low B

madgal

I nearly cried.
In fact I sat there staring at the questions with different letters going through my head for the equations.

What was with the copper Q?

I did about half of section B - as in half questions. That was really unneeded... I needed a C2 in that - so didnt get it, and now facing the fact I'm not going to college next year.

nedward

Thought it was a sound paper with the exception of the question on the metre bridge. Some strange questions thrown into question one.

EDIT that Fermi question-is it on the course? Wikipedia sh*ites on about quantum mechanics about it.

moggins

the expirments questiond f***ed me up the hole..... and since when is enrico fermi on our course???? c***s

Nehpets

All the exps: Predicted and fair. Only 2 graphs. I did all four because I feck up 3. Approx focal length isn't the same as finding the average focal length is it?

Q.5 Short questions.. Easy and fair
Q.6 Wanted Hooke's Law to come up but not like this. Only got the definition and the derivation. and the period of oscillation
Q.7 Wanted Doppler Effect to come up but thought this was hard. Go definition, explanation. "emission spectrum"? Never heard of it but I bull**** a bit there. Maths .. I didn't get, might have got some
Q.8 Attempted this even though I didn't study elec.
Q.9 Skipped
Q.10 (a) didn't know the equation or how to calc the energy
Q.11 Fair. "why is silicon a semiconductor?" because it feels like it?
Q.12 (a)easy, only mech on the paper (d) easy but didn't know the equation

stepperupper

Failed miserably! I'm so depressed right now. There's no way I got 40% of that paper correct. Nothing I studied came up. It was so obscure. I think I might try and score some heroin.

Carsinian Thau

madgal wrote:

now facing the fact I'm not going to college next year.

I wouldn't worry too much about it. They'll have to adjust the marking scheme to generate a specific percentage of A's B's and C's so you could do alright. Also, you have other subjects to rely on so one paper can't throw you off just like that.

moggins

madgal wrote:

I needed a C2 in that - so didnt get it, and now facing the fact I'm not going to college next year.

my thoughts exactly on the journey home!!!!!

ninebeanrows

Anyone want to post up solution for Q6 i think i did okay in it but really dont know!!

I skipped past all the hard questions!

Did 5,6,9,10 and 12

Nuclear and Particle Phys went well

But i messed up my parts of Q12

Did 2 good experiments and 1 awful one.

All in all would be disappointed if i don't get a C3/C2

stepperupper

Weathercheck wrote:

Anyone want to post up solution for Q6 i think i did okay in it but really dont know!!

Solutions? The test is over mate. Take you're C3 and head away.

cookiemonst3r

Three letters: wtf

I mean you'd think theyd at least make a doable paper!! that was actually impossible.

Splicer

i thought the whole paper was ambiguous, didnt like it at all..
damn

Haven't a Clue

Yeah, got a lot of complaints about this paper. I did ordinary meself, with I thought was reasonably nice and easy, but higher was meant to have been a bitch.

toxick

**** paper, wanted to get a good B ill be happy if i got a C.. some of the questions were inpossible, and wtf was with the copper block Q?

mathew

I thought it was quite nice. Didnt find anything too difficult.
Did all four experiments, Q5,6,7,10a,11 and 12 a and d
Cant complain really, some of the questions were tricky i got them out. 12a couldnt have been easier, lovely 28marks in the bag there.

Easier markes hopefully if theres all these complains!!!

sheroo_05

I would consider myself to be an A1 physics student but after that paper I would be lucky to get a B. That was the hardest paper ever. Every question had some tricky part to it and they were worth alot more marks aswel, then usual....

carlowboy

It was a ridiculously hard paper....but doable. I'm reasonably confident about it though.

Wasn't the fermi thing about the gamma radiation? I'm not sure.

As for to get the speed of the proton, you had to use E=QV
and then E= half mv^2 where the charge of a proton is equal to the charge of an electron.

madnirvana

Hopefully an A:D

was easy tBh..

but like doppler effect qs was hard.. i founf 12 hards aswell...

focal lenth qs hmmm i got 12 with calculations but i couldnt get it from graph:mad:

anyone got it from graph? how?

mathew

carlowboy wrote:

Wasn't the fermi thing about the gamma radiation? I'm not sure.

I thought it was to do with the nutrino. I know Pauli discovered it, but did Fermi propose it, or something...

madnirvana wrote:

anyone got it from graph? how?

Find where the graph crosses the axis

ninebeanrows

I might have got like 6/40 in Q2 though.

I done it totally wrong instead of finding the change of temp of copper i did final temp - initial temp..... ughhhhhho ughhhhho

cormac17

it defo was da hardest exam of da lot!!:(:(:(,,,none of the easy definitions came up like newtons laws!!!!,,,hated da exam really!!! sat there nd nearly cried!!lol,,,but did get in2 it in da end!!!,,thank god its over now!! not sure if i passed or not!!:(:(

Splicer

i just realised i confused fission and fusion

why oh why

Karlusss

Thought it was okay. Bit of thinking involved. Hopefully C1 or B3.

moggins

actually adding up the mark i know i got theres a good chance i might just get a c2 or c1... though in saying that i think i only got like 40 marks in section A.
but got high marks i'd say in Q5,11,12. okish in 10a and i reckon full marks in ques 7. emission line spec thing is on the chem course too so yeay....

nedward

Q 6
Calculate spring constant

Use k=F/s

period use T=2pi/w

Max acceleration

I did 300mm-200mm to get the range of oscillation, then used my answer from the previous

k/m=w^2

a=w^2s

Length of the string-I thought this was zero, but at the fixed point on its path, its acceleration is zero, so whatever that point is (285mm?)

mathew

nedward wrote:

I did 300mm-200mm to get the range of oscillation, then used my answer from the previous

Wasnt it 285 because thats where the equilibrium point is with the mass attached....

nedward

mathew wrote:

Wasnt it 285 because thats where the equilibrium point is with the mass attached....

Yuh, but I took it as it'd go above that point with its kinetic energy, then come back down, and since that's its original equilibrium...


EDIT F*ck it, I'm not sure even now. Anyway, no point in post mortems, I'm going to sleep.

eZe^

mathew wrote:

I thought it was to do with the nutrino. I know Pauli discovered it, but did Fermi propose it, or something...



Find where the graph crosses the axis

I think fermi predicted that it was the anit neutrino that conserves momentum in beta decay. Well thats what I wrote down anyway!

nick23

Didnt find it too hard but it was no where near nice. Dont think ill get the A i wanted but hopefully itll b marked easy seeing as everyone thinks it was so hard!

Cipriana

I knew I shouldnt have come on here! I'm realising all the things I got wrong!! I got the focal length = 0.084, I think I even realised it was wrong at the time and just left it. I'm an idiot. Q8 what's the actual answer to (ii) and why does charge reside on the outside of a conductor? I said something about it being perpendicular. And why is silicon a semiconductor? Well I have to try and forget about it because I've chemistry tomorrow, fun.....

moggins

what did people plot against each other in the graph for focal length. was it 1/u against 1/v. but didn that give you a curved graph... why......

madnirvana

anyone got the answer for

10 a i???

i get like 11580473 m/s

microbiek

mathew wrote:

Wasnt it 285 because thats where the equilibrium point is with the mass attached....

ye...........that was really hard does any1 know what the emission line spectrum is????? is it the return wave from the star at the lower frequency???

DtotheK

the seaction a was grand i thought. didn't do Q 4(despise electricity)

The copper one was just heat gained by water = heat lost by copper (which was worked out in part (i) (i think) )

SHM question was tricky ... hoping for attempt marks but all the rest were allright ish ... had to make up a bit here and there..


Silicon is a semiconductor cause it's conductivity is between tha of a good insulator and a good conducter. and it's easy to get stoned..


I think emission line spectrum is the light from that gay star viewed through a spectro scope and it gives you a black backround and coloured lines showing different wavelengths of light emitted (or is that frequencies....)

People got the star was goin away from earth ??

carlowboy

mathew wrote:

I thought it was to do with the nutrino. I know Pauli discovered it, but did Fermi propose it, or something...

I thought it was neutrino too, but as far as I know, Fermi just named it. Pauli proposed it, other 2 men found so I thought, what's left for Fermi? So, the closest thing to Beta that I could think of was Gamma radiation.

bryanw

I didn't think that paper itself was too bad... it was a little on the difficult side and they did ask a few strange bits. I did Q1,2,3,5,7,10(b),11 and 12 (c) and (d).

Experiments were ok except I got a bit confused about how the temp. of the copper was taken. Also what was up with the graph on Q3? I couldn't find anything in any of my physics stuff about drawing a graph for the concave mirror experiment. Was completely unexpected.

I though Q5 was quite easy compared to what it can be like.

Good thing I studied the Doppler effect over the weekend for Q7. Just got a bit mixed up on the last calculation.

Q10 (b) I got the first two part but after that nothing... never studied motors or stuff like that.

Q11 was ok except what did they mean for how much energy is produced every minute? It said "300 gigawatts are produced today...." What did they mean by "today"? Was it today as in "these days" or "every day" or "this year". I just decided to take it as 300 GW in one day and then worked it out.

Q12 wasn't too bad - but I didn't get everything - didn't get the 10 marker on part (c). I'm a bit iffy about whether or not I got that half-life calculation and the last bit for (d).

microbiek

moggins wrote:

what did people plot against each other in the graph for focal length. was it 1/u against 1/v. but didn that give you a curved graph... why......

no its a line that cuts the axis at somewhere around the 8

carlowboy

Aye, got 1/f= .084

eZe^

microbiek wrote:

ye...........that was really hard does any1 know what the emission line spectrum is????? is it the return wave from the star at the lower frequency???

Its in chemistry too, its when an element is heated its electrons are excited jump to next energy level, come back down emitting a photon of definite energy which corresponds to a line on that elements emission spectrum.

carlowboy

F*** it was the neutrino. Well that's 3-6 marks down the drain.

Fobia

moggins wrote:

what did people plot against each other in the graph for focal length. was it 1/u against 1/v. but didn that give you a curved graph... why......

1/f = 1/v + 1/u. Some quick maths gives you 1/f = (v + u)/vu, invert and you have f = vu / v+u. So pop the vu on the Y axis, v + u on the X axis for your straight line through the origin. Then the slope of this is the focal length. Doubt any one of ye care any more though

madnirvana

anyone got the answer for

10 a i???

i get like 11580473 m/s

microbiek

carlowboy wrote:

Aye, got 1/f= .084

ah no i added them and said it was 16.45 or sumtin because it was already 1/u etc....i duno!!!!

JC 2K3

It was a hard paper. Q2 was a disgrace. I know I used a electricity and a fúcking Joulemeter when doing that experiment and last time I checked the syllabus, you were allowed use and learn either method.

Did all right in 1,3 and 4, but I didn't feel I did great.

Ironically, the only formula I happened to not know, T = 2pi/w, and the only area of mechanics I'm not doing for applied maths, SHM, came up. I could have persevered with Q6 and perhaps got an answer, but I decided to leave it and do other questions instead.

In the end I found there was more than enough time and I did every question bar 2(which, as I've mentioned above, had a part that's optional on the syllabus and 6(which I did half of).

Right now I've no clue how I did, probably in the B2 - A1 range, fairly happy with it.

carlowboy

where it hits the axis should be equal which is equal to 1/f

ZorbaTehZ

I was rather happy with it, if I may say so. Only think was that I only had about 10 bloody minutes to look over the test at the end.

Answered:
Q5 Very nice.

Q12 A and D, A a basic App Math question, D was nice too.

Q6 Another basic App Math, messed up the arithmetic here though, but was able to fix it at the end.

Q8 Ok question, never seen Butterfly Net Experiment on a paper though, so I'm not sure if my diagram was great. I kinda just slopped through the arithmetic here (found it hard to focus for some reason), I took the charge to be concentrated at its center. I thought comparing 4C with 5uC was kind of off-putting.

Q10A Nice question, all seen before.

--

Q1 Typical question

Q2 Typical question

Q3 Made an absolute b0llox of my graph. Couldn't remember what I was supposed to plot, so I did U against V (lol), and drew a line up where U equals V and let it equal 2f.

Pissed off didn't get enough time to look over everything properly though.