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    I'm off now guys, good luck to everyone. Take it question by question and relax. Hope you all get As. Hopefully when I check this forum around 3/4pm then we'll have all done well. Take care.
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    in beta plus decay what happens to the mass and proton number? is it the same as the beta minus decay? thaaaaanks
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    can someone please explain 6b on jan 2013?
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    (Original post by acsecnarf)
    in beta plus decay what happens to the mass and proton number? is it the same as the beta minus decay? thaaaaanks
    In Beta plus, mass number stays the same, and the atomic number decreases by 1.
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    (Original post by yajman)
    In Beta plus, mass number stays the same, and the atomic number decreases by 1.
    thanks!!
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    I'm almost off now guys, so I wish you all the very best of luck. Stay calm, stay focused and believe in yourself. If you've worked hard, then you'll almost certainly do well. Break a leg
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    Good luck, may the force be with you.
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    6b anyone?
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    Anyone know the circuit symbol for a variable power supply
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    (Original post by x-Sophie-x)
    In this interaction, can someone please explain why strangeness is not conserved?

    Sigma plus--> pi plus + n

    Posted from TSR Mobile
    I presume because the the occurence is due to the weak interaction, where strangeness does not have to be conserved.
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    Why is a fluorescent coating used with a mecury coating ??
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    (Original post by GeneralOJB)
    Good luck, may the force be with you.
    Shoulda saved that one for Unit 2!

    May the /electromotive/ force be with you all Good luck everyone!
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    (Original post by hassantahir)
    Anyone know the circuit symbol for a variable power supply
    A cell with an arrow through it!
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    (Original post by Xiomara)
    Shoulda saved that one for Unit 2!

    May the /electromotive/ force be with you all Good luck everyone!
    This is from unit 1 aswell as this is EMF of a battery
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    Good luck to everyone

    Go ham on the exam!


    This was posted from The Student Room's iPhone/iPad App
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    (Original post by Lukerobbo)
    Why is a fluorescent coating used with a mecury coating ??
    In a fluorescent tube, there are low pressure mercury atoms.
    At either end of the tube there are two electrodes that have a large potential difference (voltage) between them.
    this accelerates electrons from one electrode to the other (from -ve to +ve)
    these electrons then collide with the gaseous mercury atoms giving some of their electrons enough energy to move to a higher energy shell.
    the exited electrons only stay in this shell for a short time and move back their ground state, releasing a high energy photon (in the uv spectrum)
    This is where the fluorescent coating comes in, these absorb the high energy photons, raising some of their electrons multiple energy levels. These electrons then cascade back down the energy levels releasing lower energy photons that are in the visible spectrum that we can see.


    sorry for hasty reply, hope it makes sense, I'm off to take the exam now!
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    This was posted from The Student Room's iPhone/iPad App
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    So guys what did you think? hoping for an A
 
 
 
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