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AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] Watch

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    Can any Astro person help me define what a quasar is?
    I know it's a very luminous and distant body that has been red shifted large amounts, but what actually is it?


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    For all those doing astrophysics, here's my personal revision guide:

    CD223's guide to Astrophysics
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    [QUOTE=CD223;55461345]Can any Astro person help me define what a quasar is?
    I know it's a very luminous and distant body that has been red shifted large amounts, but what actually is it?
    We have been told they are "star like" objects!!!

    But all you need to know is what you said above!!!
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    (Original post by Hellomoto.)
    We have been told they are "star like" objects!!!
    But all you need to know is what you said above!!!
    I've heard they link to black holes - how?


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    [QUOTE=CD223;55472677]I've heard they link to black holes - how?
    I dont understand this but it is in my notes
    As they are very luminous, emission lines are present which means energy is generated through non-thermal mechanisms. Very long baseline interferometry shows that the central energy source is confined to a volume of space similar to the size of the solar system. This implies that the energy source is the infall of matter to a supermassive balck whole which is throught to be at the centre of every galaxy.

    A foreign language to me!!! Just glad we DONT need to know this but its interesting!!
    Sorry the reply thing isnt working having to do a quick reply!
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    (Original post by Hellomoto.)
    As they are very luminous, emission lines are present which means energy is generated through non-thermal mechanisms. Very long baseline interferometry shows that the central energy source is confined to a volume of space similar to the size of the solar system. This implies that the energy source is the infall of matter to a supermassive balck whole which is throught to be at the centre of every galaxy.
    Ah okay - thank you!


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    (Original post by CD223)
    That's very true.

    We have an EMPA prep lesson right before the exam. I think it will only stress me out lol.


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    Not really sure if our teacher is planning on doing EMPA prep in this weeks lessons or just general revision sessions... I'd hate to do it straight before the exam though!
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    (Original post by Lau14)
    Not really sure if our teacher is planning on doing EMPA prep in this weeks lessons or just general revision sessions... I'd hate to do it straight before the exam though!
    Haha. My day is physics EMPA lesson, free period, EMPA, free period. Essentially this day is dedicated to it.

    See you on the other side... 😁


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    (Original post by CD223)
    Haha. My day is physics EMPA lesson, free period, EMPA, free period. Essentially this day is dedicated to it.

    See you on the other side... 😁


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    So you finished your empa exam?
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    (Original post by CD223)
    Haha. My day is physics EMPA lesson, free period, EMPA, free period. Essentially this day is dedicated to it.

    See you on the other side...


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    I've got double physics tomorrow afternoon, 1 hour on Thursday, but on Friday I've just got double chemistry and the EMPA which because it's right where my maths lesson should be. Hope yours went well!
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    (Original post by DCMed96)
    So you finished your empa exam?
    Yeah, finished it today. Relieved in a way, but just want to know my result.


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    (Original post by Lau14)
    I've got double physics tomorrow afternoon, 1 hour on Thursday, but on Friday I've just got double chemistry and the EMPA which because it's right where my maths lesson should be. Hope yours went well!
    Thank you!

    Ah I'm just glad it's over. Got a month until my next exam now. Need to keep at it


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    (Original post by CD223)
    Thank you!

    Ah I'm just glad it's over. Got a month until my next exam now. Need to keep at it


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    Ha my first exam after the EMPA is next Wednesday :/ busy few weeks doing maths past papers now I think!
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    (Original post by Lau14)
    Ha my first exam after the EMPA is next Wednesday :/ busy few weeks doing maths past papers now I think!
    Ah I have 7 exams now. 3 maths, 2 physics and 1 computing and history
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    (Original post by CD223)
    Ah I have 7 exams now. 3 maths, 2 physics and 1 computing and history
    It doesn't even feel like exams are about to start yet, feels like there's still ages to go!
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    (Original post by Lau14)
    It doesn't even feel like exams are about to start yet, feels like there's still ages to go!
    I totally agree. Oh my the amount of messages I've been getting since I said I'd done the EMPA is ridiculous


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    Hey CD223 check your pm please
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    (Original post by sm1297)
    Hey CD223 check your pm please
    I have, and I'm afraid I can't disclose any more information than is given in Lau14's guide to the A2 EMPA.


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    So what paper are we all planning to start first in the actual exam? I'm planning to start the option topic paper first; turning points for me.
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    (Original post by Protoxylic)
    So what paper are we all planning to start first in the actual exam? I'm planning to start the option topic paper first; turning points for me.
    Nice! Id say start with your most confident unit. I might start with the core PHYA5 content.


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