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

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    (Original post by cajach)
    You are a godsend! Thanks so so much
    No problem!
    Just to let you know know there is a typing error in the last bit of the second point. I meant to say protons and neutrons (constituents of all nuclei) have a greater mass when they are separated.
    I said they have a greater mass when they joined which is incorrect!
    Edit: ignore me, i used the word "than" which makes it fine

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    (Original post by cajach)
    I get it too now! Glad we could help each other out

    Good luck in the exam!
    And good luck to you too!!
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    (Original post by Sbarron)
    Yaaaayy I finally get it!!! It's all about wether the reaction needs energy supplied to make it happen or wether it happens naturally due to instability!
    So in fission (breaking a nuclei into all it's constituent parts) energy would be required so a greater mass in the products.
    In natural fission (including the bombardment of uranium) you are releasing energy to make more stable products so the mass of the products is less!!!

    😊
    You've understood it better than me


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    (Original post by Mehrdad jafari)
    No problem!
    Just to let you know know there is a typing error in the last bit of the second point. I meant to say protons and neutrons (constituents of all nuclei) have a greater mass when they are separated.
    I said they have a greater mass when they joined which is incorrect!
    Edit: ignore me, i used the word "than" which makes it fine

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    The one last thing that doesn't make sense it that for helium fusion we release energy so get lower mass but we need energy to overcome the electrostatic force (hence high temps)

    So I'm guessing the energy required is negligible in comparison to energy released right?
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    (Original post by Sbarron)
    The one last thing that doesn't make sense it that for helium fusion we release energy so get lower mass but we need energy to overcome the electrostatic force (hence high temps)

    So I'm guessing the energy required is negligible in comparison to energy released right?
    Yes because you're using the energy to overcome the repulsion so it isn't available to become mass
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    (Original post by Mehrdad jafari)
    You've understood it better than me


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    Haha I doubt that... Anyway thanks for helping I think a fresh mind this morning was required!
    After all this I bloody well hope it comes up!!
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    (Original post by AR_95)
    Yes because you're using the energy to overcome the repulsion so it isn't available to become mass
    Oh yes of course!
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    (Original post by Sbarron)
    Oh yes of course!

    You're right though, the word Release is a headache in this topic
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    After spending hours upon hours trying to understand fusion and fission it better bloody come up in the exam this week otherwise I'm going to literally explode and release enough energy to create the next Big Bang!!!
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    (Original post by AR_95)
    You're right though, the word Release is a headache in this topic

    Also I like to think of 'unbinding' rather than 'binding' sometimes
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    (Original post by Sbarron)
    After spending hours upon hours trying to understand fusion and fission it better bloody come up in the exam this week otherwise I'm going to literally explode and release enough energy to create the next Big Bang!!!
    I'm praying for a lovely 15 marks on fission and the nuclear reactor too. Maybe even in the sun


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    Hi, could some tell me do we need to know about argon dating?
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    Does anyone know the experiment/ apparatus used to test charles law??
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    (Original post by gcsestuff)
    I'm praying for a lovely 15 marks on fission and the nuclear reactor too. Maybe even in the sun


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    Yep me too
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    (Original post by noseypo)
    Does anyone know the experiment/ apparatus used to test charles law??
    Even better could anyone give us a model answer for this sort of question please?
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    (Original post by Sbarron)
    Even better could anyone give us a model answer for this sort of question please?
    2nd that


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    Is this the general idea of the inversion tube experiment:

    Lead spheres are heated to a certain temperature.

    They are then put in a tube and the tube is rotated a certain number of time.

    Due to energy loss from gravity, mgh and the total no. Of rotations we can say that mcT=mghn

    Which cancels to give us c= gln/T


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    (Original post by gcsestuff)
    Is this the general idea of the inversion tube experiment:

    Lead spheres are heated to a certain temperature.

    They are then put in a tube and the tube is rotated a certain number of time.

    Due to energy loss from gravity, mgh and the total no. Of rotations we can say that mcT=mghn

    Which cancels to give us c= gln/T


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    Think so yep. Just remember details of the experiment
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    (Original post by AR_95)
    Think so yep. Just remember details of the experiment
    Found a question in the old papers - june 2005 q4 - unit 2




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    (Original post by gcsestuff)
    Found a question in the old papers - june 2005 q4 - unit 2

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    Wow, where do you get these questions from
 
 
 
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