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

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Reply 660
Avatar for CD223
CD223
OP
10
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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Reply 661
Avatar for CD223
CD223
OP
10
For all those doing astrophysics, here's my personal revision guide:

CD223's guide to Astrophysics
Original post by CD223
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!!!
Reply 663
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CD223
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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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Original post by CD223
I've heard they link to black holes - how?
I dont understand this but it is in my notes:biggrin:
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!
Reply 665
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CD223
OP
10
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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Reply 666
Avatar for Lau14
Lau14
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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!
Reply 667
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CD223
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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?
Reply 669
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Lau14
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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! :smile:
Reply 670
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CD223
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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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Reply 671
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CD223
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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! :smile:


Thank you!

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


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Reply 672
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Lau14
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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 :smile:


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Ha my first exam after the EMPA is next Wednesday :/ busy few weeks doing maths past papers now I think!
Reply 673
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CD223
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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 :colondollar:
Reply 674
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Lau14
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Original post by CD223
Ah I have 7 exams now. 3 maths, 2 physics and 1 computing and history :colondollar:


It doesn't even feel like exams are about to start yet, feels like there's still ages to go!
Reply 675
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CD223
OP
10
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 :frown:


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Reply 676
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sm1297
Hey CD223 check your pm please
Reply 677
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CD223
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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.
Reply 679
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CD223
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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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