ughhhhhhhhh i hate this exam.
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OCR Physics B G495 Field and Particle Pictures June 21st 2011 Exam Thread watch
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TimesChanging
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- 19-06-2011 20:04
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TimesChanging
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- 19-06-2011 20:04
i mean.... I REALLY HATE THIS EXAM.
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Summerdays
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- 19-06-2011 20:04
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- 19-06-2011 20:12
trying to guess whats most likely to come up in sec B, it's futile i know because they're bound to ask us stuff that has no relation to what we have been doing because it's OCR B!! :| but maybe nuclear reactors? what about feynman diagrams blerghhhh.
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Summerdays
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- 19-06-2011 20:14
(Original post by Birkatron)
trying to guess whats most likely to come up in sec B, it's futile i know because they're bound to ask us stuff that has no relation to what we have been doing because it's OCR B!! :| but maybe nuclear reactors? what about feynman diagrams blerghhhh.Last edited by Summerdays; 19-06-2011 at 20:26. -
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- 19-06-2011 20:20
(Original post by Summerdays)
It will most likely be a weird paper. Is OCR B the worsT board for physics? -
Summerdays
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- 19-06-2011 20:25
(Original post by JoeCarr)
sorry, but, grammar nazi here; it may be a science thread but I do lit and am afraid I can't refrain... -
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- 19-06-2011 20:28
haha, I don't mind typos but that stood out like a sore thumb to me
and yeh, the section C in January was good with the exception of that exponential part :P -
Summerdays
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- 19-06-2011 20:31
(Original post by JoeCarr)
haha, I don't mind typos but that stood out like a sore thumb to me
and yeh, the section C in January was good with the exception of that exponential part :P
But the section C from June 2010 was a blessing -
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- 19-06-2011 20:35
(Original post by Summerdays)
I must be the only person who didn't like that section C
But the section C from June 2010 was a blessing -
Summerdays
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- 19-06-2011 20:37
(Original post by JoeCarr)
But just think how much more prepared you are after those questions for this advance notice, compared to ones you are looking at with no prep -
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- 19-06-2011 20:43
im stuck, could anybody please explain Q 10 c) ii) is that equation:
dose rate = (activity x energy x q )/m. something we should know, plus is it any different from absorbed does = (energy x q)/m -
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- 19-06-2011 20:48
(Original post by Birkatron)
im stuck, could anybody please explain Q 10 c) ii) is that equation:
dose rate = (activity x energy x q )/m. something we should know, plus is it any different from absorbed does = (energy x q)/m -
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- 19-06-2011 20:50
(Original post by Birkatron)
yeah our teacher told us how to test for exponential relationships basically y0/y1 = y1/y2 and etc, as for coming up with the equation im not sure but do you do A level maths because you'll have done differential equations in that??
(Original post by Summerdays)
Hmm, that's true. I just hope we get an easy, straight-forward paper on tuesday. I really, really need an A in physics!Last edited by emzaz; 19-06-2011 at 20:52. -
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- 19-06-2011 20:50
(Original post by JoeCarr)
without checking the paper, i'd say just remember absorbed dose is energy*quality/mass (which is also given in the formula booklet), and that activity is rate of decay (units = s^-1) so multiplying the absorbed dose by the activity gives you the 'dose rate'. -
Summerdays
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- 19-06-2011 20:51
(Original post by Birkatron)
im stuck, could anybody please explain Q 10 c) ii) is that equation:
dose rate = (activity x energy x q )/m. something we should know, plus is it any different from absorbed does = (energy x q)/m
How I think of it is that the activity gives you the number of disintegrations per econd, which means it tells you the amount of the particular radition particle (determined by the effective factor, q.) So it tells you how frequently a body/organ of mass M is absorbing a particle with energy E with an effective factor q (which takes into acount it's range/penetration and ionisation ability.) -
Unkempt_One
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- 19-06-2011 20:53
This is probably going to end up being the exam where I'll have revised the least. Then again, about half of the unit is on really easy stuff like radiation dosage and binding energy.
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Summerdays
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- 19-06-2011 20:55
(Original post by Unkempt_One)
This is probably going to end up being the exam where I'll have revised the least. Then again, about half of the unit is on really easy stuff like radiation dosage and binding energy. -
Unkempt_One
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- 19-06-2011 20:57
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- 19-06-2011 20:58
(Original post by Unkempt_One)
I'm sure I'll be fine, I've done well on the past papers I did.
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