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    (Original post by splashywill)
    -thermionic emission
    -magnetic lens - condenses electron been towards sample
    -(sample)
    -objective lens - deflects and inverts scattered electrons
    -(Inverted first image)
    -microscopic lens- focuses on centre of first image and inverts into high resolution final image
    -(final image)

    -limitations
    - Thickness of the sample can cause the electron beam to slow down therefore reducing de broglie wavelength and worsening resolution
    - uneven thickness of sample can cause different amounts of diffraction for electron beam therefore making the distorting final image.

    (I did this mainly for my own revision... but this is pretty much all you need to learn about them)
    Thanks😭


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    (Original post by AQATrolledMe)
    Damn i never thought of that , anxiety gonna kill me, we better have something amazing to do in summer
    I've got some trip plans but I'll definitely be still moaning about my results, just like last year lol. I can never distract myself enough
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    ASTROPHYSICS

    Would it be possible for a 6 mark question on how supernovae form? Or the lifecycle of our sun?
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    Any ideas for the 6 markers for the main paper or medical physics?
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    Why doesn't the electron simply spiral inwards to the nucleus
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    (Original post by C0balt)
    I've got some trip plans but I'll definitely be still moaning about my results, just like last year lol. I can never distract myself enough

    well, I wish you the best of luck tomorrow :crossedf:
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    (Original post by veldt127)
    Any ideas for the 6 markers for the main paper or medical physics?
    Medical physics- hopefully about biopotentials, I don't think that's been a six marker since 2010 . There's a medical thread by the way if you have questions
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    (Original post by AQATrolledMe)
    well, I wish you the best of luck tomorrow :crossedf:
    Same to you man
    I hope your username doesn't become true
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    (Original post by particlestudent)
    Medical physics- hopefully about biopotentials, I don't think that's been a six marker since 2010 . There's a medical thread by the way if you have questions
    cheers
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    (Original post by marcusman97)
    ASTROPHYSICS

    Would it be possible for a 6 mark question on how supernovae form? Or the lifecycle of our sun?
    6 marker on the lifecyle of a star or formation of a red giant would be a gift. Hope something like this comes up
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    Anyone else doing Applied physics? Any tips?
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    (Original post by TajwarC)
    6 marker on the lifecyle of a star or formation of a red giant would be a gift. Hope something like this comes up
    Could you outline this for me please???
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    (Original post by Ainsleyy)



    That is literally everything you need to know about CCDs.
    Heycan you help me on question 1 aii) I was thinking of using theta = R/d, with R being 1 AU and d with the distance provided, but this results in an incorrect answer, isn't that what I'm supposed to do for parallax? I really don't understand why the mark scheme used s = r*theta

    Question: http://prntscr.com/blswf1
    Answer:http://prntscr.com/blswku
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    (Original post by arrow_h)
    Could you outline this for me please???
    Is it on the spec though? Nothing has ever really appeared in past papers
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    (Original post by d14m)
    Why doesn't the electron simply spiral inwards to the nucleus
    Quantum physics, isn't necessary at all for the exam.

    http://www.fnal.gov/pub/science/inqu...tions/bob.html
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    Name:  unit 5.JPG
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    (Original post by marcusman97)
    Is it on the spec though? Nothing has ever really appeared in past papers
    Not sure... this is what the spec says
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    (Original post by arrow_h)
    Could you outline this for me please???
    Formation:
    -stars formed in gas clouds such as nebulae
    -the dust particles are attracted towards eachother by gravity
    -they form a clump which heats up as it gets more massive
    -eventually forming a protostar
    -as the core heats up, hydrogen can fuse into helium, this is when the star is a main sequence star
    -the outward pressure of the large amounts of energy released by hydrogen fusion prevents the star from collapsing under its own gravity

    Formation of a Red Giant
    -the hydrogen in the core beings to run out. As the Hydrogen to helium core burning stops, the star expands and the outer layers (shells) cool down (this is when the star becomes red)
    -the core heats up enough to allow helium to oxygen and carbon core burning.
    -Hydrogen to helium shell burning occurs.
    -Once the helium in the core runs out, Helium to oxygen and carbon shell burning occurs.
    -In lower mass stars the core will not heat up to allow any more fusion so it contracts under its own gravity (this is eventually stopped due to electron degeneracy pressure) and into a white dwarf where it will continue to cool and fade away

    -In a large star the gravity will cause it to contract more than in the above example (electron degeneracy pressure cannot prevent more contraction in this case) and will cause an explosion i.e. a supernova.
    -leaving behind a black hole or neutron star


    pls be on the spec I didn't memorise all of that for nothing lmao
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    Anyone doing Turning Points feel like they're ****ed? the mark schemes are soo specific
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    (Original post by cjlh)
    Anyone doing Turning Points feel like they're ****ed? the mark schemes are soo specific
    yes
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    (Original post by Patrick Gekko)
    yes
    I haven't been able to revise properly until tonight due to FP3 and S2 as well so I'm so far behind. Any ideas what to focus on? I'm so so screwed
 
 
 
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