June 2011 G485-Fields, Particles and Frontiers of Physics

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Original post by Oh my Ms. Coffey

Well theres only been 2, both of which the capacitor stuff was easy on.

Yeah thats great once you know how to do it but its a relative thing. . . I can guarantee that those aren't the easiest questions that can come up lets put it that way, and its a new specification so whatever they haven't pulled out their arse yet is likely to come up. Just don't get complacent =P

Reply 621

yokabasha

Do gamma cameras give 3-d or 2-d images?

and are gamma cameras used for both PET and gamma emittin isotopes

(edited 12 years ago)

Reply 622

Oh my Ms. Coffey

Original post by Lengalicious

I thought the spec paper was quite hard in some areas, the question on an experiment to differentiate between the different types of radiation and the typical penetration values completely got me.

Reply 623

Lengalicious

How did everyone find C4 today? xP

Reply 624

Captain Hob

Original post by yokabasha

Do gamma cameras give 3-d or 2-d images?

2D, but if you put two gamma cameras at right angles you get 3D.

Reply 625

MarieLyon

Original post by Oh my Ms. Coffey

I thought the spec paper was quite hard in some areas, the question on an experiment to differentiate between the different types of radiation and the typical penetration values completely got me.

i thought the spec paper was extremely difficult!

Reply 626

Oh my Ms. Coffey

Heres a nice formula for people to use

N=(m/M)xNa

N = Number of particles/whatever
m = mass we are dealing with
M = Atomic number as a metric in KG Eg. Uranium238 = 0.238
Na = Avagadro's constant

With this you can work out how much mass of a substance or how many particles there are.

Reply 627

MarieLyon

Original post by Lengalicious

How did everyone find C4 today? xP

I had C3 today.

Reply 628

Lengalicious

Original post by MarieLyon

I had C3 today.

wasnt that exam last thursday lol?

Reply 629

morleyman200

haha found out why im worrying about capacitors, my exam is the G495, its a good start considering its tomorrow :P

Reply 630

Oh my Ms. Coffey

Original post by Lengalicious

wasnt that exam last thursday lol?

MEI C3 was today.

Reply 631

muffingg

I just hope none of the medical crap comes up!

Order of preference:

Electric Fields
Magnetic Fields
Electromagnetism
Capacitors
Cosmology
Nuclear Physics
.
.
.
.
.
Medical Physics

Reply 632

Raimu

I had C4 today, not allowed to talk about it I think. All I'm gonna say is I think I have an A* now.

Reply 633

Oh my Ms. Coffey

Original post by muffingg

I just hope none of the medical crap comes up!

Order of preference:

Electric Fields
Magnetic Fields
Electromagnetism
Capacitors
Cosmology
Nuclear Physics
.
.
.
.
.
Medical Physics

Im starting to like medical, its nice once you remember it.

Reply 634

Raimu

Medical is awesome, it's just remembering stuff, easy marks.
Capacitors and fields can be tough if the examiners want to be dicks with the questions.

Reply 635

Lengalicious

Original post by muffingg

I just hope none of the medical crap comes up!

Order of preference:

Electric Fields
Magnetic Fields
Electromagnetism
Capacitors
Cosmology
Nuclear Physics
.
.
.
.
.
Medical Physics

judging by what didnt come up in the last 2011 jan paper, im guessing there will be a question utilising the equation f ' = c/(c-2v) x f in ultrasound, in med imaging there will probz be a question on PET scan or gamma camera as MRI was in last paper,

Reply 636

Pandit Bandit

describe and interpret Hubble’s redshift
observations and what he deduced from it?

Reply 637

MarieLyon

Original post by Lengalicious

wasnt that exam last thursday lol?

i think that was M1

maybe even endoscope

Original post by Pandit Bandit

describe and interpret Hubble’s redshift
observations and what he deduced from it?

Hubble measured the redshift values of distant galaxies and drew a graph of apparent speed against the distance to the galaxy. His graph was a straight line through the origin, indicating that apparent velocity of recession is proportional to the distance to the galaxy. That's where we get Hubble's constant.