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astrophysics watch

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    astrophysics, hows everyone finding it?
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    where you revising from
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    im finished astropphysics for definate
    from my astrophysicds text book
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    what you doing edexcel physics
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    yep
    are u
    im reisitin phy 1 and 3 tomos
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    (Original post by mathematician)
    yep
    are u
    im reisitin phy 1 and 3 tomos
    why is everyone talkin about pixel size for ccd and photographic,
    i thought there were just sizes of grains suspened in emulsion.
    i cant b on the same ededxcel board then, cos that aint on ours
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    have you noticed they always give you questions in the exam that arent even in the text book.
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    (Original post by Tennis)
    have you noticed they always give you questions in the exam that arent even in the text book.
    nope not ne more
    this text book of mine sums up everything
    gotta go though duda
    lata
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    (Original post by mathematician)
    nope not ne more
    this text book of mine sums up everything
    gotta go though duda
    lata
    u can ask me questions on here actaully
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    what text book is that
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    (Original post by Tennis)
    what text book is that
    its called astrophysics, covers AS and A2 physics
    published from bath university
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    what do you need to know about radio telescopes and the stuff that isnt mentioned on the syllabus
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    (Original post by Tennis)
    what do you need to know about radio telescopes and the stuff that isnt mentioned on the syllabus
    radio waves arent affected by earths amtosphere,
    radio waves provides information on chemical properties of stars, and can also detect very dim stars
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    you know they ask you the questions on formation of supernovae theyre so much you can write. how do you know the points they want.
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    (Original post by Tennis)
    you know they ask you the questions on formation of supernovae theyre so much you can write. how do you know the points they want.
    4 things for 4 marks

    1) immense heat caused by gravitational collapse
    2) e + p ----- > n
    3) extra energy produces shockwave
    4) all outer layers blown into interstellar space leaving a neutron core

    no need to rite bout the formation of black holes and neutron stars ... tht will probably be the next question
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    For Edexcel you need to know pixel and grain size.
    Grain size is small, between 0.1 and 1 micro metres allowed in markscheme
    Pixel size is larger, between 5 and 50 micro metres.

    And for supernovae:

    -Red giant collapses under gravity
    -Forcing electrons into the nuclei forming a dense ball of neutrons
    -Molecules hit this very dense structure and rebound
    -At a very high speed

    Is what I would write.
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    The practice papers aren't reflective of what we're gona get in our exam remember - they're harder. They were designed to be done in 45 mins, the new ones are designed to be done in 30mins.
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    (Original post by mathematician)
    astrophysics, hows everyone finding it?
    good, on the basis that it's just expansion of the universe, hubble laws/constants, redshift etc. I can't get to grips with double slit interference :rolleyes: I lose so many marks on those questions.

    Edit: Whoops, sorry, regurgigating Unit 4 Universe stuff. N/A ignore me.
 
 
 
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