IGCSE Edexcel Physics Paper 2 June

Although I was flustered, I think i did not do too badly. (in terms of getting an overall A*) Only will find out in August >.<
Time to put it behind me and get on with other exams.

Reply 41

apselv

Original post by ei200496

did you guys have a problem with the last last question? the one where it said why to change direct current to alternating current? it confused me because I thought generators, since in an electromagnetic field follow Flemings left hand rule and thus generate an alternating current anyway?
plus the question before that on why are voltages increased before transmition? it was 4 marks but all id ever learnt was that current decreases so less energy is lost as heat.. how is that 4 marks?

"plus the question before that on why are voltages increased before transmition? it was 4 marks but all id ever learnt was that current decreases so less energy is lost as heat.. how is that 4 marks?"

answer for this question:
higher voltage so current decreases. Less energy losses, so becomes more efficient. Thinner cables could be used so cost is less.

Reply 42

parasagarwal01

Original post by apselv

"plus the question before that on why are voltages increased before transmition? it was 4 marks but all id ever learnt was that current decreases so less energy is lost as heat.. how is that 4 marks?"

answer for this question:
higher voltage so current decreases. Less energy losses, so becomes more efficient. Thinner cables could be used so cost is less.

Transformers need AC to be transmitted not DC so they must be converted to DC

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Reply 43

apselv

Original post by alexgr97

I except the boundaries to be low 130s. Totally strange paper. Just had no clue how to go about answering the questions.

Grade boundaries will definitely be low this time.

Reply 44

parasagarwal01

Original post by apselv

Grade boundaries will definitely be low this time.

Lol I wouldn't lie but people are expecting the grade boundary to be around 140. Some people did find this paper easy as well but not me :/

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Reply 45

gianamar

2

Hey guys, something I found interesting about the bar chart question and an in-depth explanation as for why the student was right:
Planck's equation tells us that E=hf.
We know from the wave equation that f=c/λ. Therefore, E=hc/λ.
We know from our definition of potential difference that: V=E/Q.
Therefore, rearranging V=E/Q for E, we obtain E=VQ.
Therefore, substituting into Planck's equation we get VQ=hc/λ.
Rearranging for voltage, we get V=hc/Qλ, hence proving that voltage is inversely proportional to wavelength!
:smile:

Reply 46

Polydeuces

Hey guys, something I found interesting about the bar chart question and an in-depth explanation as for why the student was right:
Planck's equation tells us that E=hf.
We know from the wave equation that f=c/λ. Therefore, E=hc/λ.
We know from our definition of potential difference that: V=E/Q.
Therefore, rearranging V=E/Q for E, we obtain E=VQ.
Therefore, substituting into Planck's equation we get VQ=hc/λ.
Rearranging for voltage, we get V=hc/Qλ, hence proving that voltage is inversely proportional to wavelength!

nice! will be useful for AS levels lol since gcse Physics is finished >.>
ans yeah i got that answer too but i explained it in words rather than mathematical symbols

(edited 10 years ago)

Reply 47

Polydeuces

Original post by apselv

"plus the question before that on why are voltages increased before transmition? it was 4 marks but all id ever learnt was that current decreases so less energy is lost as heat.. how is that 4 marks?"

answer for this question:
higher voltage so current decreases. Less energy losses, so becomes more efficient. Thinner cables could be used so cost is less.

I talked about it being needed travelling long distances in the national grid, efficiency, V=IR (less resistance therefore less electrical energy lost as heat therefore more efficient) Will i still get 4 marks?

Reply 48

KashimaK

I hope the boundaries will be low... but I'm worried that the exam board might suddenly decide to raise the grade thresholds, simply because way too many people have been getting A*/A in the recent years and also this paper was the first one for the new specification (June 2013) so it might be the best opportunity for the examiners to do nasty things to us...

Reply 49

Polydeuces

Original post by KashimaK

I hope the boundaries will be low... but I'm worried that the exam board might suddenly decide to raise the grade thresholds, simply because way too many people have been getting A*/A in the recent years and also this paper was the first one for the new specification (June 2013) so it might be the best opportunity for the examiners to do nasty things to us...

agreed

Reply 50

hhalai96

1

Why was it suppose to be a bar chart??
I don't get it

Reply 51

gianamar

2

Original post by hhalai96

Why was it suppose to be a bar chart??
I don't get it

I think that we were meant to draw a bar chart, with the different colours along the horizontal axis, and with the (minimum) voltage along the vertical axis.

Reply 52

legolas2

i understand the moment one, but for momentum is it force= change in momentum/ time?

Reply 53

ReubenC29

2

Original post by legolas2

i understand the moment one, but for momentum is it force= change in momentum/ time?

yep

Reply 54

ReubenC29

2

Original post by hhalai96

Why was it suppose to be a bar chart??
I don't get it

the x-axis variables were discrete not continuous. some of my friends drew a scatter chart. that could get marks but im not sure.

Reply 55

parasagarwal01

Bar chart bar chart bar chart

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Reply 56

Polydeuces

no the data was categoric. You should know that when the data is presented in categories, you always draw a bar/line/pie chart. That is indisputable. It is basic science/statistics.

Anyways lets put this exam behind us, we do not have a physics paper 3. What's done is done... for now. (those who are doing AS)

(edited 10 years ago)

Reply 57

Gloham

You say that its categoric data, and that's the simple conclusion to jump to. However if you correctly realised that you should rearrange the colours into ascending frequencies (Red orange yellow green blue), and plotted this information, it was quite clear that a straight line of best fit was the way to go. So even though it had names, it wasn't simply names, it was frequencies. Just my opinion, still could be wrong...

Reply 58

ReubenC29

2

i totally forgot about the order of frequency when plotting my graph :frown:

could that be a marking point?

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Reply 59

alexgr97

3

Original post by Gloham

You say that its categoric data, and that's the simple conclusion to jump to. However if you correctly realised that you should rearrange the colours into ascending frequencies (Red orange yellow green blue), and plotted this information, it was quite clear that a straight line of best fit was the way to go. So even though it had names, it wasn't simply names, it was frequencies. Just my opinion, still could be wrong...

Exactly, this is what I did. We should still get some of the marks.

IGCSE Edexcel Physics Paper 2 June

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