haha i guess, maybe whoever set it just fancied being really mean.
It's a ridiculous question. Hey OCR B physics, why don't you ask us some physics questions? Preferably questions that coincides with your damn (almost non-existent) syllabus!
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.
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.
It will most likely be a weird paper. Is OCR B the worsT board for physics?
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
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'.
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??
Please tell me this was a lesson we had when I wasn't there? :/ I don't remember about this at all! I thought exponential was where it decreases in proportion to the amount remaining or something along those lines?
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'.
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
energy x q/m = effective dose, not ABSORBED dose.
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.)
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.
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.