Students helping students, join us in improving Bored of Studies by donating and supporting future students!
"but the wine and the song like the seasons all have gone"bottle01 said:my optional question was on medical physics
the question was quite straight forward. some were even similar to the past CSSA papers. i was soooooo surprised in the exam.
how did you find it?
Bone scans are different to PET arn't they, bone scans release gamma rays directly to gamma cameras over a long period of time to find high activity on BONES, where as Pet scans emitt positrons with anialate with electrons and release gamma from there. thats what i thought anywaymica said:went fairly well. Although i didnt know a bone scan was a PET scan... so i did a bit of jabbering on about xrays and ct scans
The units at the top of the table state x 106Bricnic said:Did anyone else trip over the very first question, speed of sound in fat? According to the formula given in the back, Z = pv, and if I'm not mistaken, Z is the acoustic impedance, p is the density of the medium and v is the speed at which sound travels. However, if you sub in the values they gave for AIR, you get a horrendously incorrect measurement of the speed of sound in air- the table gave these values:
Material_____Acoustic impedance____Density
___Air__________0.0004____________1.3
..and if you sub these into the formula:
0.0004 = 1.3 * 340 (speed of sound in air is 340m/s, as given in the data sheet)
But this is clearly wrong? 1.3 * 340 = 442 as far as I can see...
Wow, that explains it. Just did the calculations quickly, and you're of course correct. Damn that, as if they'd trick us by deliberately giving wrong units. Curse them all to heck.helper said:The units at the top of the table state x 106
That is why it is worth 2 marks, a lot of students won't correct the units from the table
i know!!!! i just did that question the day before the exam...XcarvengerX said:And the 7 marker question is the exact copy of CSSA 2006 7 marker, except it is "assess" not "compare", and because I only read CSSA answers once long time ago, I totally forgot about radio wave being used in MRI, but otherwise my assessment for the "assess" is pretty good I believe.
Ah serious? So you didn't get to finish?bottle01 said:i know!!!! i just did that question the day before the exam...
however, i was asked 'pens down' when attempting the third paragraph on that question...
misery...:mad1: