# WJEC A2 PH5 Exam 18th June

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Hey, just wondering if anyone wants to discuss the exam tomorrow on what will likely come up in both the core exam and the case study.

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#2

Case study there'll probably be a lot of equation checking/number crunching and some deriving of certain equations.

Nuclear I'd expect the usual stuff...they hardly seem to change. They might ask for uses of radioisotopes. Also a rotating coil explain question might be asked for. Linear accelerator for B-fields maybe? Whichever way, I'm not looking forward to this..

Nuclear I'd expect the usual stuff...they hardly seem to change. They might ask for uses of radioisotopes. Also a rotating coil explain question might be asked for. Linear accelerator for B-fields maybe? Whichever way, I'm not looking forward to this..

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(Original post by

Case study there'll probably be a lot of equation checking/number crunching and some deriving of certain equations.

Nuclear I'd expect the usual stuff...they hardly seem to change. They might ask for uses of radioisotopes. Also a rotating coil explain question might be asked for. Linear accelerator for B-fields maybe? Whichever way, I'm not looking forward to this..

**13 1 20 8 42**)Case study there'll probably be a lot of equation checking/number crunching and some deriving of certain equations.

Nuclear I'd expect the usual stuff...they hardly seem to change. They might ask for uses of radioisotopes. Also a rotating coil explain question might be asked for. Linear accelerator for B-fields maybe? Whichever way, I'm not looking forward to this..

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#4

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Would you be able to outline the basic information we need to know about the different types of particle accelerators and how they work please?

**JakeDaw**)Would you be able to outline the basic information we need to know about the different types of particle accelerators and how they work please?

The fundamental particle accelerator doesn't have much to it...an electric field is generated between the anode and the cathode and this accelerates the electron.

(note that I'll keep referring to "the electron" but you could have a proton or alpha or whatever..so in place of where I say "e", you'd need 2e for an alpha for instance)

Then there's the first alternating pd one. (thing it's called linear accelerator?) Essentially the electron is first attracted to a tube of positive PD, then as it goes through said tube the PD turns negative and it is accelerated out, then the next tube turns positive and so on... the AC frequency is not altered while the gap between tubes and their size must be increased in order to account for the acceleration

The cyclotron is another one with constant frequency (and B field); this is the first one where you'd need to compare Bve to mv^2/r (or use omega if frequency is asked for); essentially the cyclotron has the electron spiralling out in circles, as the electron is being accelerated the radius of its path must increase.

This is because if you simply that expression you have Be = mv/r Be is constant so v/r is constant

The synchrotron is another circular one and perhaps the nastiest; the AC voltage frequency and the B field are constantly changing because the particle moves in a circle of sustained radius. The electron is accelerated in a somewhat similar way to the linear accelerator, it goes through 4 tubes per cycle such that the voltage alternates fully twice (so circular motion frequency is half the AC frequency: important to remember). The B field increases in order that, as before Be = mv/r can be constant (since v is increasing but m/r and e are constants)

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(Original post by

**13 1 20 8 42**)Posted from TSR Mobile

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#6

(Original post by

Wow thank you so much for that, you really typed a lot and it makes such a difference for my exam tomorrow! Physics is the one exam I'm a bit unsure about reaching my conditional offer for (even if I am a bit more secure in PH5 than PH4). I hope the exam goes well for you tomorrow.

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**JakeDaw**)Wow thank you so much for that, you really typed a lot and it makes such a difference for my exam tomorrow! Physics is the one exam I'm a bit unsure about reaching my conditional offer for (even if I am a bit more secure in PH5 than PH4). I hope the exam goes well for you tomorrow.

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I guess nothing can be much worse than my PH4 though..

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#7

If they ask us to derive equations, would most things be on the data sheet or are there ones we should remember? Really worried about the case study, not sure what to expect

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#8

Can someone explain to me how conservation of energy applies to the rocket in the case study ? Thanks for the help!

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#9

(Original post by

If they ask us to derive equations, would most things be on the data sheet or are there ones we should remember? Really worried about the case study, not sure what to expect

**gilbertblythe**)If they ask us to derive equations, would most things be on the data sheet or are there ones we should remember? Really worried about the case study, not sure what to expect

(Original post by

Can someone explain to me how conservation of energy applies to the rocket in the case study ? Thanks for the help!

**wb25**)Can someone explain to me how conservation of energy applies to the rocket in the case study ? Thanks for the help!

edit: I don't have a great understanding of the case study to be honest (and I can kind of imagine how the water "pushes" up against the gas but it feels weird to say it's compressing it when the pressure is actually going down)

If anyone reads this probably best to completely ignore the rocket part, I haven't a clue

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**wb25**)

Can someone explain to me how conservation of energy applies to the rocket in the case study ? Thanks for the help!

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#11

How did it go ?

It was so different to all the past papers I'm not sure how I did to be honest!

It was so different to all the past papers I'm not sure how I did to be honest!

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#13

(Original post by

How did it go ?

It was so different to all the past papers I'm not sure how I did to be honest!

**wb25**)How did it go ?

It was so different to all the past papers I'm not sure how I did to be honest!

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I managed to finish it all but left out the last question on the cyclotron because I couldn't figure out how to work the velocity out. I now realise it was an energy problem but I'm not to worried about it. It was very different to past papers so I'm hoping the grade boundaries will reflect that. Luckily though the medical physics option was a breeze

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I also thought the case study wasn't that bad actually as well. Could've been a lot worse

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#17

I thought it was hard to begin with but found it ok after I went back over stuff. I didn't like the first question on capacitors at all though. My option (energy matters) could hardly have been any easier however! I thought the case study questions were quite easy this time. What did everyone else think about the case study?

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#18

That was the weirdest PH5 paper ive done... even weirder than last year. Hopefully i get an A. Dreams of an A* smashed....

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#19

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That was the weirdest PH5 paper ive done... even weirder than last year. Hopefully i get an A. Dreams of an A* smashed....

**Techroks**)That was the weirdest PH5 paper ive done... even weirder than last year. Hopefully i get an A. Dreams of an A* smashed....

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#20

The case study and Materials was fine. Expected it to be harder in these two sections to be honest...

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