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PHYA1 - Physics Unit 1 Exam - 24th May 2011 watch

  • View Poll Results: Are you resitting this unit?
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    What was the I value for that question?
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    Electron hits atom
    Gives orbital electron energy
    Orbital electron moves to higher energy level
    As it moves down it release a photon with an energy equal to hf
    The fact that we only see line spectra instead of a continuous spectrum shows that there must be discrete energy levels

    Not sure what is on the Mark scheme though
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    cheerz guys
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    (Original post by questionandanswer)
    Electron hits atom
    Gives orbital electron energy
    Orbital electron moves to higher energy level
    As it moves down it release a photon with an energy equal to hf
    The fact that we only see line spectra instead of a continuous spectrum shows that there must be discrete energy levels

    Not sure what is on the Mark scheme though
    Excitation perhaps as a key work.
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    (Original post by maths134)
    Excitation perhaps as a key work.
    Oh god , I think I forgot to put that
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    (Original post by frenchie.b)
    What was the neutral particle that decayed. question oneeeee
    sigma with zero charge
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    What do you think 100UMS will be?
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    (Original post by questionandanswer)
    Oh god , I think I forgot to put that
    The thing with science is you can describe something in so much detail and forget a key word... *sigh* anyway probably only a mark, depending on 'de-excitation' being key.
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    (Original post by Dizzy in my Head)
    I got baryon, too, as the baryon number would not be conserved if it wasn't.
    it was sigma with no charge. baryon is right to make the interaction conserved
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    (Original post by maths134)
    The thing with science is you can describe something in so much detail and forget a key word... *sigh* anyway probably only a mark, depending on 'de-excitation' being key.
    I'm always taught stuff in lots of detail as my school want to "teach us the subject, not just just pass an exam" and then any extra knowledge won't get a mark whereas one key word will :/
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    (Original post by questionandanswer)
    I'm always taught stuff in lots of detail as my school want to "teach us the subject, not just just pass an exam" and then any extra knowledge won't get a mark whereas one key word will :/
    Yeh I get what your saying, its really annoying when you 'understand' it and others dont and simply put said key word and get the mark.
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    what was x + how many marks does the power dissipated is worth. i did energy insead
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    how many mark was a stable hardon worth missed that out( what page was this question on )
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    (Original post by maths134)
    isa are marked harshly because of how people do. So 35/50 could be a D/best a C. So its likely to be around 42 ums, if u do get 80 ums and then 120 then its an A. But its looking unlikely because 80 ums seems optimistic for ur raw score.
    but there is still hope right? =S lol, im really planning on doing 8 hours a day for unit 2 during half term, i want to get top ums for this unit really badly, and I already find it to be my strongest topic =/ hopefully I just scrap an A if not retake unit 1 lol
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    (Original post by gids)
    what was x + how many marks does the power dissipated is worth. i did energy insead
    power=energy/time... since time = 1 second, then surely power=energy in this case?
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    (Original post by number23)
    power=energy/time... since time = 1 second, then surely power=energy in this case?
    how many mark was it worth for the question
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    (Original post by gids)
    how many mark was it worth for the question
    2marks
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    (Original post by gids)
    it was sigma with no charge. baryon is right to make the interaction conserved
    No, I'm sure it was baryon - loads of people have agreed with me. There was a proton on the right hand side and nothing else, so there must be one on the other side to conserve it.
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    (Original post by Notsocleverstudent)
    2marks
    thanks yesss!!!. what baryon did you put for x and what page was the question of the stable hadron and how many marks was that?
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    (Original post by Dizzy in my Head)
    No, I'm sure it was baryon - loads of people have agreed with me. There was a proton on the right hand side and nothing else, so there must be one on the other side to conserve it.
    sigma is a baryon + proton does not have a neutral charge
 
 
 
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