phy 6 comprehension homopolar generator...

S1M

ok a linac:
this works on the principle of electronic attraction
ok.... im stuck already :biggrin:

...
can i use a picture?

Why not? It's hard, all I can babble on about is alternating voltage, accelerating the particle between adjacent plates, but I don't know why...and it's the same with the cyclotron. Why do the particles accelerate in the gap between the two plates?

And also, with the linac, the pd plates get longer and longer so the particle can still be accelerated, why?

Thank you :smile:

Reply 21

when the particle gets faster it passes the plates faster. either the alternating current has to have its frequency increased or the plates have to be longer for it to keep accelerating.

Reply 22

ok lets give it another shot...

an alternating current is applied to a set of tubes each getting progressively longer
alternating tube are connected to the same terminal
when a electron is released from the radiation source
the first tube (which is positively charged), attracts the electron through it
the electric field of this tube provides a force to accelerate it
then by the time the electron reaches the next tube the alternating current switches so the next tube is positive and the same thing happen, however the tube needs to be longer as the electron is moving faster
then same thing happens with successive tubes until it hits the fixed target at the end of the set of tubes...

well im not good at explaining but i hope that helped...

ps. the tubes are in a vacuum

Reply 23

btw dont you have the NAS physics books? all this is in there

Reply 24

Oh I do, I use breithaupt normally though, great book! I just keep forgetting after I read it... :frown:

Will give NAS a scan after my economics exam tomorrow. :smile:

thanks guys! (yes it has helped). btw, so the electron is repelled the tube it just passed through and attracted by the tube it's approaching? Ergo the resultant forces accelerates it?

Reply 25

yeah like those magnetic train things in japan..

..except theyre magnetic and trains

Reply 26

IMO the nas book is not good for this stuff...
advanced physic for you is the bestest book for a level physics :smile:

Reply 27

zoidberg

yeah like those magnetic train things in japan..

..except theyre magnetic and trains

excellent, will regurgitate that tomorrow! :smile:

I hope we have lots of mechanics calculations in that paper...

Reply 28

Mysticmin

so the electron is repelled the tube it just passed through and attracted by the tube it's approaching? Ergo the resultant forces accelerates it?

not sure what ergo means but yeah i think u got the idea

Reply 29

S1M - do you mean Understanding physics for advanced level (3rd edition)?

Reply 30

oh all i have is NAS and a really old A-Level physics book by MUNCASTER. the nas one is a bit brief so theres no point in reading it probably

Reply 31

I have about 8, don't use 7 of them. The NAS books are really brief, if you went by them alone you'd be lucky to scrape a C...

Reply 32

Mysticmin

S1M - do you mean Unverstanding physics for advanced level (3rd edition)?

hmm let me check what it exactly says... i thought it says advanced physics for you... but that might be another book...

Reply 33

Mysticmin

I have about 8, don't use 7 of them. The NAS books are really brief, if you went by them alone you'd be lucky to scrape a C...

hey... dont diss NAS... them alone got me As in modules 1-4 :biggrin:

Reply 34

S1M

hey... dont diss NAS... them alone got me As in modules 1-4 :biggrin:

I hate them :biggrin:

Not helpful at all when I'm stuck on a question! My teachers are both brilliant so I use the notes they give me most of the time.

Reply 35

hmm let me check what it exactly says... i thought it says advanced physics for you... but that might be another book...

yup its called advanced physics for you... imo the best physics text book i have ever seen (other than the NAS, i have only seen about 3 or 4 text books though)...

Reply 36

S1M

yup its called advanced physics for you... imo the best physics text book i have ever seen (other than the NAS, i have only seen about 3 or 4 text books though)...

It's my favourite book, the only one I use!

Reply 37