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# GCSE Physics P3 - 24/05/2012

Physics exam discussion - share revision tips in preparation for GCSE, A Level and other physics exams and discuss how they went afterwards.

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1. GCSE Physics P3 - 24/05/2012
Hey, there wasn't any thread around so i made a new one.

Are you guys ready for the P3 physics exam, and what are the main things which we should revise? And what might be coming up?
Last edited by Coveted Ul; 22-05-2012 at 11:17.
2. Re: GCSE Physics P3 - 24/05/2012
You should revise everything from the P3 topics..anything could come up. However, look at the past papers and see what type of questions normally appear and look at the mark schemes to see how to answer them. I'm also sitting this exam and I am so scared Good luck!
3. Re: GCSE Physics P3 - 24/05/2012
anyone have any useful notes about pulse oximetry?
4. Re: GCSE Physics P3 - 24/05/2012
does anyone know what formulas we need to learn (not the ones providd)?
5. Re: GCSE Physics P3 - 24/05/2012
Memorize:

1). P=m X v (incase, there hasn't been a momentum question in the past papers, so they might put one in)

And

2. Current (I) = (n X e) / t

n - number of electrons
e - charge of electrons
t - time (in seconds)

The rest will be given to you.
6. Re: GCSE Physics P3 - 24/05/2012
Any one got any good points/notes on electron beams?
Would be so grateful!!
7. Re: GCSE Physics P3 - 24/05/2012
I found a great set of online flashcards on p3 which definately helps. http://quizlet.com/12255177/edexcel-p3-flash-cards/
8. Re: GCSE Physics P3 - 24/05/2012
(Original post by Coveted Ul)
Memorize:

1). P=m X v (incase, there hasn't been a momentum question in the past papers, so they might put one in)

And

2. Current (I) = (n X e) / t

n - number of electrons
e - charge of electrons
t - time (in seconds)

The rest will be given to you.
thanks.. what does the P stand for though (sorry physics isn't my best subject)?
9. Re: GCSE Physics P3 - 24/05/2012
P - is momentum (in kg m/s)
10. Re: GCSE Physics P3 - 24/05/2012
does anybody know how to tell when the source required needs a short half life or not?
11. Re: GCSE Physics P3 - 24/05/2012
Yeah the source needs a short half life when it is a tracer because it is inside the body so can damage healthy cells, but if the source is being used in radiotherapy as a treatment then a longer half life is more practical or hospitals would have to contsantly replace the radioactive sources. I hope this helps.
12. Re: GCSE Physics P3 - 24/05/2012
Can somebody please help me with endoscopy because I'm finding it hard to get it in my head in short little steps - the book is really confusing me HaHa xD
13. Re: GCSE Physics P3 - 24/05/2012
(Original post by hypanx)
thanks.. what does the P stand for though (sorry physics isn't my best subject)?
Sorry having a really stupid moment here but what does the m and the v stand for in the P=m X v equation? Is it mass and voltage?
14. Re: GCSE Physics P3 - 24/05/2012
(Original post by Katy1704)
Sorry having a really stupid moment here but what does the m and the v stand for in the P=m X v equation? Is it mass and voltage?
nearly there - m = mass and v = velocity

so momentum = mass / velocity
15. Re: GCSE Physics P3 - 24/05/2012
(Original post by Katy1704)
Can somebody please help me with endoscopy because I'm finding it hard to get it in my head in short little steps - the book is really confusing me HaHa xD
it took a long time for me to understand too, dont worry.

so endoscopy is when thin, thin optical fibres are inserted into the body to take a look at tumours, joints etc. whats so special about endoscopy is that fact that it uses total internal reflection to channel light INSIDE the body so that the doctors can actually see what's going on in there. otherwise, it would be pitch black, right?
there are two wires involved - one is used to channel the light via total internal reflection and the other is a camera which displays whats going on inside the screen.

so

1) the light reflects internally through 1 set of optical fibres, reflected repeatedly until they come out at the end.
2) the light is reflected off the objects inside the body which is of interest (kidney stones, tumours etc)
3) camera records whats going on and sends it back up to the doctor.

I've seen past paper questions where they ask the reasons as to why endoscopy is better than open surgery. well..

1) endoscopy is known as keyhole surgery, which as the title suggests, only cuts a little hole in the body. I would prefer a tiny hole compared to having my insides dissected apart, wouldn't you?
2) it's quicker
3) it's easier to do checkups and moniter progress as it can be done more often than open surgery, for obvious reasons.
4) the recovery time is dramatically smaller.

any questions, let me know. hope i helped
16. Re: GCSE Physics P3 - 24/05/2012
17. Re: GCSE Physics P3 - 24/05/2012
Physics=FML.
18. Re: GCSE Physics P3 - 24/05/2012
(Original post by Shields56)
Physics=FML.
you only get out what you put in! if you're taking it tomorrow, good luck!
19. Re: GCSE Physics P3 - 24/05/2012
(Original post by lettucesoap)
you only get out what you put in! if you're taking it tomorrow, good luck!
Thanks, you too. I have done soooo much revision but it's till one of my killer exams
20. Re: GCSE Physics P3 - 24/05/2012
Please could someone explain what an ECG is? I've seen it crop up in past papers but don't understand. Thanks

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