[milliezhao]

How many ums do u think 53 would be?


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[internet tough guy]

(Original post by Seb Hudson)
Here is a mark scheme for the exam that my friend sent me! I'll be honest and take no credit for this but still, enjoy

I know you didn't write this mark scheme, so this is a general query for anyone who's read it,

on question 5bi), my method was 7.5/85 instead of 15/(85 + 85) because I thought the weight would be shared by both springs so I just divided the weight by 2. I've check it, both methods gave the same answer, so have I used the wrong method? would I lose a mark here?

also for the question near the end where it asks which way the particle would move on the longitudinal wave, is anyone sure that is correct on the mark scheme? because I thought it would move to the left.

[milliezhao]

(Original post by internet tough guy)
I know you didn't write this mark scheme, so this is a general query for anyone who's read it,

on question 5bi), my method was 7.5/85 instead of 15/(85 + 85) because I thought the weight would be shared by both springs so I just divided the weight by 2. I've check it, both methods gave the same answer, so have I used the wrong method? would I lose a mark here?

also for the question near the end where it asks which way the particle would move on the longitudinal wave, is anyone sure that is correct on the mark scheme? because I thought it would move to the left.

Yer I'm sure is correct because my revision guide says that it is moving to the right!


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[Benniboi1]

(Original post by internet tough guy)
I know you didn't write this mark scheme, so this is a general query for anyone who's read it,

on question 5bi), my method was 7.5/85 instead of 15/(85 + 85) because I thought the weight would be shared by both springs so I just divided the weight by 2. I've check it, both methods gave the same answer, so have I used the wrong method? would I lose a mark here?

also for the question near the end where it asks which way the particle would move on the longitudinal wave, is anyone sure that is correct on the mark scheme? because I thought it would move to the left.

See my video above, I'm sure it's to the right for the longitudinal wave question

[internet tough guy]

Just my luck then, the question was 50-50 on correct/wrong and I manage to get both of them wrong by pointing the direction in the opposite directions, I've think I've now lost about 18-19 marks

[Amirrryy]

i think the last question for the direction of the arrow on the waves were down and left consecutively .... are you sure its up and right cos people were having arguments about this

[Amirrryy]

(Original post by internet tough guy)
I know you didn't write this mark scheme, so this is a general query for anyone who's read it,

on question 5bi), my method was 7.5/85 instead of 15/(85 + 85) because I thought the weight would be shared by both springs so I just divided the weight by 2. I've check it, both methods gave the same answer, so have I used the wrong method? would I lose a mark here?

also for the question near the end where it asks which way the particle would move on the longitudinal wave, is anyone sure that is correct on the mark scheme? because I thought it would move to the left.

thats what i got too!

[oli_G]

(Original post by Benniboi1)
Exhibit A:

I agreed with you until I saw this

I'm not convinced

http://www.youtube.com/watch?v=f66syH8B9D8

[Amirrryy]

I have 3 questions from the exam from which i would really appreciate if someone would help me clarify if i have got any marks on them or not.
1) Can someone please answer me i really want to know if i would get any marks on the question that asked why are fibre cores made as narrow as possible? i said this reduces the possibility of light leakage (signal loss) which causes the signal of data transmission to get weaker....really need an answer :L

2) Also for the question that asked us to describe the behaviour of point X on the wave.....will i get any marks for saying "for the first 1/4 cycle it would move up, then the next 1/4 cycle it would move down and the last 1/4 of a cycle it moves back upwards to its equilibrium position (initial position)? how many marks out of 2 would i get for saying that?

3) i think the last question for the direction of the arrow on the waves were down and left consecutively .... are you sure its up and right cos people were having arguments about this...thats what i put

thanks in advance

[JenniS]

think I lost about 7-10 marks, what grade do you think that will be?
still kicking myself for crossing out the right angle and changing it to the wrong one!

[RooT_Fifteen]

(Original post by JenniS)
think I lost about 7-10 marks, what grade do you think that will be?
still kicking myself for crossing out the right angle and changing it to the wrong one!

in terms of grade, you'll get an A :P I would presume you are asking about UMS score, and going by the poll on this thread, I think you will get something between 120 - 110 depending on the actual UMS.

and don't worry about your mistakes. I dropped 2 - 3 marks because i wrote pi rather than landa, and that I forgot to draw on the wavelength after working it out...... (plus the usual drops on the written questions i presume)

[JenniS]

(Original post by RooT_Fifteen)
in terms of grade, you'll get an A :P I would presume you are asking about UMS score, and going by the poll on this thread, I think you will get something between 120 - 110 depending on the actual UMS.

and don't worry about your mistakes. I dropped 2 - 3 marks because i wrote pi rather than landa, and that I forgot to draw on the wavelength after working it out...... (plus the usual drops on the written questions i presume)

A cool thanks, still can't get over crossing out 65 and changing it to 55 :'( hate how everyone makes silly mistakes, feel like shouting at the examiner saying 'I can do it I promise!' Desperate to get an A, messed up unit 1 in jan and ended up with a C after getting A's in practice papers, so took that again, just hope I didnt mess them up again! Hope you get an A too

[cooldudeman]

(Original post by oli_G)
It is 180 degrees out of phase as it is a standing wave, but you're right they probably want a written,not numerical, answer.

hey bro you know for the triangle question on q1, i dont think i got the 2/2 marks but i wrote,
B^2+C^2=A^2 so there is no acceleration so it moves at constant velocity and there are no other external forces acting on it.

do you think id get like one mark?

[RooT_Fifteen]

(Original post by KNJ)
This is regarding question 6 about whether the X and Y points on the wave r in phase or not!! in the exam i wrote not in phase for both of them as if u look clearly they do not look in phase and after the exam my physics teacher also looked at the paper and sed they are both not in phase.

they are not. the markscheme someone posted earlier got that question wrong I think

[skibur]

(Original post by KNJ)
This is regarding question 6 about whether the X and Y points on the wave r in phase or not!! in the exam i wrote not in phase for both of them as if u look clearly they do not look in phase and after the exam my physics teacher also looked at the paper and sed they are both not in phase.

once again; it was a stationery wave not a progressive wave. You can determine the phase relationship by simply looking at the nodes between the two points (for a stationery wave).

[adam17]

(Original post by RooT_Fifteen)
they are not. the markscheme someone posted earlier got that question wrong I think

Do you think I'd get the mark for putting almost in antiphase for the first one, and almost in phase for the second one?
Dont ask me why I put that I have no idea why I did :')

[al_nad12]

For the arrows on the last page... do the arrows have to be touching point P and Q or can they just be above the spring(wave) ?

[al_nad12]

(Original post by Monster94)
I put them all to 2sf too because the values in the qeustion were! I hope we're right!!!

I hve put them 2sf too.... checked with my teacher. We'll be awarded the marks

[al_nad12]

(Original post by milliezhao)
For 3bii) it didnt change force to mass, but I did use f=ma do I get a mark?


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yeah you definitely do

[cooldudeman]

(Original post by al_nad12)
yeah you definitely do

hey, you know for the triangle question on q1, i dont think i got the 2/2 marks but i wrote,
B^2+C^2=A^2 so there is no acceleration so it moves at constant velocity and there are no other external forces acting on it.

do you think id get like one mark?