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OCR Advancing Physics G492 ~5 June 2013~

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Reply 80
Anyone know what the core boundaries roughly are for this unit?
Reply 81
Another one is lambda=c*h/photon energy for the wavelength of a type of light
So if its open at one end and closed at the other fundamental frequency occurs at 0.25 the wavelength? And if its closed/open at both ends its at half the wavelength?
Reply 83
Original post by walkers38
Is this anyone's last exam? Mine is. I'm so unmotivated for this. Argh

Still got 3 more after tomorrow. COMP2, C3 and C4. I finish on the 18th of June :frown:
Reply 84
Original post by The Monk
Anyone know what the core boundaries roughly are for this unit?

Around 70/100 for an A, low 60s for a B, around 55 for a C
Reply 85
Original post by m00c0w
Around 70/100 for an A, low 60s for a B, around 55 for a C

Cheers, think I need 130 UMS for an A (unless my retake improves my unit 1 score). And about 100 UMS for a B which is probably more likely unless we get a nice paper.
could someone pleaseee explain the photoelectric effect? Thanks so much :smile:
Reply 87
Original post by The Monk
Cheers, think I need 130 UMS for an A (unless my retake improves my unit 1 score). And about 100 UMS for a B which is probably more likely unless we get a nice paper.

Good luck! I think I need around 105 UMS for an A if my G491 went as well as I think it did. Just hope they don't ask us any tricky questions on the pre-release as I haven't done much work on that
Reply 88
Original post by walkers38
Is this anyone's last exam? Mine is. I'm so unmotivated for this. Argh


Precisely what I thought last summer (well actually I got heatstroke just before). This is my third time resitting it as I need the grades for uni.. Don't do it to yourself! :frown:
Reply 89
Anyone else think the section c questions are not really physics?
Original post by walkers38
Is this anyone's last exam? Mine is. I'm so unmotivated for this. Argh


Same, did chemistry today and bio on monday :s-smilie:
Reply 91
Original post by upthegunners
could someone pleaseee explain the photoelectric effect? Thanks so much :smile:


Basically UV light was shone onto a metal plate and if the electrons on the surface absorbed enough energy, they could escape from the surface.
There were 3 observations that suggested electrons act as particles:
1) There was a minimum frequency (called threshold frequency) that the electrons needed to absorb before they could escape
2) Increasing the frequency increased the kinetic energy of the electrons
3) Increasing the intensity increased the no of electrons that were emitted
Reply 92
Original post by upthegunners
could someone pleaseee explain the photoelectric effect? Thanks so much :smile:


It's what introduced the theory that light can't only be described as a wave.

* Threshold frequency: minimun energy photoelectrons must have to be emitted off.
* Max. kinectic energy increases with increasing frequency.
* No. of photoelectrons emitted per second is proportional to the intensity of the radiation.

If light was only a wave, the max. kinetic energy should increase with intensity of the wave. But it depends on frequency which mucked up wave theory.
(edited 10 years ago)
Reply 93
Original post by marseille_h
Same, did chemistry today and bio on monday :s-smilie:


Was it f322 chemistry you did?
Original post by walkers38
Was it f322 chemistry you did?


Edexcel Unit 2
Original post by marseille_h
Edexcel Unit 2

section c :angry:

that is all :smile:
how do i prepare for section c
?? anyone
Original post by upthegunners
how do i prepare for section c
?? anyone


There are some questions on the previous pages of the thread practice on them, they often turn around uncertainty and stuff you have done during your coursework
Reply 98
I posted links to these earlier but obviously mods didn't allow it, so here are some prelease questions from my physics dept. :
38deP.jpg
38dfX.jpg
38dgC.jpg
(edited 10 years ago)
Original post by ArchieL
I posted links to these earlier but obviously mods didn't allow it, so here are some prelease questions from my physics dept. :
38deP.jpg
38dfX.jpg
38dgC.jpg



Thanks ! got the markscheme for these?:smile:

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