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    (Original post by S1M)
    ok a linac:
    this works on the principle of electronic attraction
    ok.... im stuck already ...
    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
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    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.
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    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
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    btw dont you have the NAS physics books? all this is in there
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    Oh I do, I use breithaupt normally though, great book! I just keep forgetting after I read it... Will give NAS a scan after my economics exam tomorrow.

    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?
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    yeah like those magnetic train things in japan..

    ..except theyre magnetic and trains
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    IMO the nas book is not good for this stuff...
    advanced physic for you is the bestest book for a level physics
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    (Original post by zoidberg)
    yeah like those magnetic train things in japan..

    ..except theyre magnetic and trains
    excellent, will regurgitate that tomorrow! I hope we have lots of mechanics calculations in that paper...
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    (Original post by 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
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    S1M - do you mean Understanding physics for advanced level (3rd edition)?
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    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
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    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...
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    (Original post by 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...
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    (Original post by 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
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    (Original post by S1M)
    hey... dont diss NAS... them alone got me As in modules 1-4
    I hate them 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.
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    (Original post by S1M)
    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)...
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    (Original post by 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!
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    (Original post by Mysticmin)
    I hate them 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.
    well for sypnoptic stuff i must admit they are under par... but imo they have proven to me that some are good... because by only reading them for revision in 4 modules and 4 As, cant be bad...
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    (Original post by Mysticmin)
    It's my favourite book, the only one I use!
    the one with the colourful animated pics... with those it never gets boring
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    (Original post by S1M)
    the one with the colourful animated pics... with those it never gets boring
    Think you might be stretching it there, magnetic fields never gets too thrilling! Likewise double slit interference.
 
 
 
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