** HL Physics Before / after **

bigt132

What did people do for the Boyle's Law question? Were you meant to know what set of values was volume and what one was pressure, couldn't it have theoretically been either or? And could you choose if the given volume was in mm^3, cm^3 or m^3 or would it have had to have been mm^3 using a Boyle's Law apparatus? I just let it be in m^3 cos I was confused but that's fairly unrealistic..

MarieCurie22

Leaving Cert Student wrote: »

I think mine was smaller Im not sure though... anyone else?

What did you do for it? I did (2pi^2/17^2) x 0.8??

Leaving Cert Student

MarieCurie22 wrote: »

What did you do for it? I did (2pi^2/17^2) x 0.8??

Is that .8 in terms of metres??

and is the amplitude just 17... I think that is what I did

MarieCurie22

Leaving Cert Student wrote: »

Is that .8 in terms of metres??

and is the amplitude just 17... I think that is what I did

Damn it! 0.8cm! f*ck! bye A1 was so close

MarieCurie22

Also wtf is the definition of the unit of charge!? I cant find it anywhere!?

D_s

MarieCurie22 wrote: »

Also wtf is the definition of the unit of charge!? I cant find it anywhere!?

Yeah that one was a weird one, my phys teacher agreed. It's that charge which, if passing a point in a conductor every second, produces a current of 1A.

MarieCurie22

D_s wrote: »

Yeah that one was a weird one, my phys teacher agreed. It's that charge which, if passing a point in a conductor every second, produces a current of 1A.

F*ck I totally made a b*lls of that q that and q 6

Leaving Cert Student

MarieCurie22 wrote: »

Damn it! 0.8cm! f*ck! bye A1 was so close

Thats hardly the A1 gone its one question which youll get most marks for anyway. did you mess anywhere else up on the paper?

MarieCurie22

Leaving Cert Student wrote: »

Thats hardly the A1 gone its one question which youll get most marks for anyway. did you mess anywhere else up on the paper?

Question 12 max i can get there is 40, (was one of my 6) question didnt know what magnets were for *facepalm*, question 9 defining bequerel i forgot the word disintegrations....and q 5 i surely f*cked one up

Leaving Cert Student

MarieCurie22 wrote: »

Question 12 max i can get there is 40, (was one of my 6) question didnt know what magnets were for *facepalm*, question 9 defining bequerel i forgot the word disintegrations....and q 5 i surely f*cked one up

Apart from 12 its not too bad? what were the magnets for btw? Think i said to accelerate particles as they circulate
q5 is best 8 so you might be ok?

MarieCurie22

Leaving Cert Student wrote: »

Apart from 12 its not too bad? what were the magnets for btw? Think i said to accelerate particles as they circulate
q5 is best 8 so you might be ok?

Thats what i said to my physics teacher all proud like i was so clever and he said the answer was in q 9....its to deflect them to keep them in circular motion

Leaving Cert Student

MarieCurie22 wrote: »

Thats what i said to my physics teacher all proud like i was so clever and he said the answer was in q 9....its to deflect them to keep them in circular motion

Well yeah to accelerate them towards centre

MarieCurie22

Leaving Cert Student wrote: »

Well yeah to accelerate them towards centre

Hmm idk if accelerate will be accepted I hope so but they were looking for deflection...odd q never seen it before!

Sean95

football girl wrote: »

I think that its the first artificial transmutation of a nucleus and verifies Einsteins photoelectric equation.
SHM too I think!

I thought it was that they found that the charge and momentum was not conserved in the equation and so this led to the discovery of the neutrino???

Quenches5

How did you calculate the speed of sound without being given the diameter of the tube i.e. c=f(4(l+0.3d)) with no d value?

MarieCurie22

Sean95 wrote: »

I thought it was that they found that the charge and momentum was not conserved in the equation and so this led to the discovery of the neutrino???

Thats for Beta decay sorry x

MarieCurie22

Quenches5 wrote: »

How did you calculate the speed of sound without being given the diameter of the tube i.e. c=f(4(l+0.3d)) with no d value?

what question was that!?

Sean95

MarieCurie22 wrote: »

what question was that!?

Q.7

Quenches5

The question on resonance and sound waves, not sure which number!

Copper_pipe

I thought I did ok in the pre but I got 26%, I don't know what to think of todays paper even though I thought it was ok

MarieCurie22

Quenches5 wrote: »

The question on resonance and sound waves, not sure which number!

slope of the graph by 4 graph being 1/lambda by frquency? idk i didnt do that q sorry

Leaving Cert Student

Quenches5 wrote: »

How did you calculate the speed of sound without being given the diameter of the tube i.e. c=f(4(l+0.3d)) with no d value?

Just using c=fl

Quenches5

Leaving Cert Student wrote: »

Just using c=fl

But then that would imply that the diameter of the tube was 0, non-existant :L i dunno what they wanted really!

Leaving Cert Student

Quenches5 wrote: »

But then that would imply that the diameter of the tube was 0, non-existant :L i dunno what they wanted really!

No it wouldnt lambda is the wavelength there isnt an end correction... i got 330ms btw

AR95

I'm fairly sure you take 550 as f and then take l(ie.30)=2(wavelength) divided by 4 and then just use c=f x wavelength. I got 330m/s using that method

Leaving Cert Student

AR95 wrote: »

I'm fairly sure you take 550 as f and then take l(ie.30)=2(wavelength) divided by 4 and then just use c=f x wavelength. I got 330m/s using that method

550.(0.6) = 330

1100(.3) = 330

or

1650(.2) = 330


Something like that anyway

magicianz

The 0.3d in that equation is a correction factor. it is only placed there because we don't live in an ideal world and that tries to make up for it a small bit ( the distance between the frequency generator, usually a tuning fork in LC labs, and the open end of the tube.) Not having that 0.3d is just not including that correction factor. It's a rough guess at correcting some inherent issue in the experiment.

MarieCurie22

can you guys answer some of these:
For q 11....
C) are the forces just tension and the weight?
H)Is the just simply explaining that electromagnetic induction is when a magnet moves in and out of a coil an EMF is produced?

Q 10....(a)
To indicate the significance of their observation (cockroft and walton)....
Would I get the marks for saying first splitting of an atom by accelerated particles?

Q9
Defining the Bequerel....I said 1 Bq = 1 atom per second I know now decaying should be in there will i lose marks?

Question 5
About the storage heater...?

Also...Fossil feuls vs. nucleur energy?

Question 12:
Here I messed up i took the displacement to be the height...if I got the height wrong in the first part but used my values from this to continue on will i get full marks for the other parts?

Also if im close to the A1 like 88.75 would they look to bring me up?

ahmdoda

im not sure about bring you up a freind of main got 84.34 in one of his exams and needed one mark for a grade yet they didnt give him it when he rechecked

magicianz

It depends entirely on the final revised marking scheme, they need to maintain their distributions! If you're even at 89.99, they will search hard for somewhere to give you that final .01, however they cannot break the marking scheme, so if they can't find it you won't get it