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

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    (Original post by _Caz_)
    Yes it is

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    What topic is that ratio relevant to?


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    (Original post by CD223)
    What topic is that ratio relevant to?


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    Evidence for the big bang theory. There are 3 hydrogens to every one helium in the universe. It's to do with the heat at the start of the universe - it was hot enough for protons/neutrons to fuse into hydrogen.

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    (Original post by _Caz_)
    Evidence for the big bang theory. There are 3 hydrogens to every one helium in the universe. It's to do with the heat at the start of the universe - it was hot enough for protons/neutrons to fuse into hydrogen.

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    Ah, it makes sense that I don't know that yet then... Covering the Big Bang theory in my next lesson! Thanks for the info though


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    (Original post by CD223)
    Ah, it makes sense that I don't know that yet then... Covering the Big Bang theory in my next lesson! Thanks for the info though


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    No problem!

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    (Original post by _Caz_)
    No problem!

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    Is there any hard topics beyond the Doppler effect?


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    (Original post by CD223)
    Is there any hard topics beyond the Doppler effect?


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    Lens calculations and resolving power for me
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    (Original post by CD223)
    Is there any hard topics beyond the Doppler effect?


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    I find the concept of parallax the most difficult thing in the whole topic. There's nothing harder than that in the whole unit. The only thing that is a little bit tricky is the units when using Hubble's constant but other than that I think you'll be okay

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    (Original post by TheRAG)
    Lens calculations and resolving power for me
    By lens calculations do you mean using that specific equation (1/f=...), or just the whole topic to do with magnification, power, collecting areas etc?


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    (Original post by _Caz_)
    I find the concept of parallax the most difficult thing in the whole topic. There's nothing harder than that in the whole unit. The only thing that is a little bit tricky is the units when using Hubble's constant but other than that I think you'll be okay

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    Oh right I think Hubble's constant is Tuesday's lesson!

    Could you kindly explain how to convert between parsecs and metres? Do I just have to "remember" 1pc = 3.08x10^16 m?


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    Has anyone done the exam questions by topic on physicsandmathstutor.com? I'm finding it really hard. I think a lot of the questions are legacy spec, so may be more difficult. Anyone had any experience?
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    (Original post by JaySP)
    Has anyone done the exam questions by topic on physicsandmathstutor.com? I'm finding it really hard. I think a lot of the questions are legacy spec, so may be more difficult. Anyone had any experience?
    I'm personally sticking to the current set of papers. I know they're limited but it's a better indication of what the exam wil be like.


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    (Original post by CD223)
    I'm personally sticking to the current set of papers. I know they're limited but it's a better indication of what the exam wil be like.


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    I may join you there as I'm frankly finding this a little disheartening. What are you using to practice?
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    (Original post by JaySP)
    I may join you there as I'm frankly finding this a little disheartening. What are you using to practice?
    I'm using the CGP guide, my own notes, the Nelson Thornes book and gonna start on past papers ASAP this week.


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    (Original post by CD223)
    Oh right I think Hubble's constant is Tuesday's lesson!

    Could you kindly explain how to convert between parsecs and metres? Do I just have to "remember" 1pc = 3.08x10^16 m?


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    It's on the data sheet, all the conversions for parsecs to lightyears/metres etc, under the astro heading
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    (Original post by Lau14)
    It's on the data sheet, all the conversions for parsecs to lightyears/metres etc, under the astro heading
    Much appreciated! I should look at that before the exam...

    What are you doing in class at the minute? We have 3 lessons left before we finish astro, then the EMPA on the 5th


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    (Original post by CD223)
    Much appreciated! I should look at that before the exam...

    What are you doing in class at the minute? We have 3 lessons left before we finish astro, then the EMPA on the 5th


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    EMPA prep/mocks recently, EMPA practical this coming week, then revision or something I expect
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    (Original post by Lau14)
    EMPA prep/mocks recently, EMPA practical this coming week, then revision or something I expect
    Sounds good! I got 3 EMPA section B papers done today which was okay - hard to do the questions that rely on part A data of course, but I guess some questions regarding proving relationships and reducing uncertainty etc could be useful.


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    (Original post by CD223)
    Sounds good! I got 3 EMPA section B papers done today which was okay - hard to do the questions that rely on part A data of course, but I guess some questions regarding proving relationships and reducing uncertainty etc could be useful.


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    Yeah I plan to mostly read through the ones that rely on the practical bit and see if I have any idea what it's on about to be honest might to the other question properly though. How did you find them?
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    (Original post by Lau14)
    Yeah I plan to mostly read through the ones that rely on the practical bit and see if I have any idea what it's on about to be honest might to the other question properly though. How did you find them?
    That makes sense! They were really hard if I'm honest. Not sure if that's because I didn't do the part As for them or what. It just was difficult to comprehend what the questions asked.

    I'm desperate for at least a C this year lol.


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    (Original post by CD223)
    Oh right I think Hubble's constant is Tuesday's lesson!

    Could you kindly explain how to convert between parsecs and metres? Do I just have to "remember" 1pc = 3.08x10^16 m?


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    I'm pretty sure it's on the formula sheet along with stuff like the distance 1AU in metres and that 1pc is 3.26ly etc...

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