Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

** HL Physics Before / after **

  • 23-05-2013 7:50pm
    #1
    Registered Users, Registered Users 2 Posts: 275 ✭✭


    Could someone put up a diagram of how two prisms can be used in binoculars. Thanks :D


«13456712

Comments

  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    Was this a question on a past paper?


  • Registered Users, Registered Users 2 Posts: 835 ✭✭✭kingcobra


    Welcome to Google Images my friend! :P

    Binoc03.gif


  • Registered Users, Registered Users 2 Posts: 275 ✭✭aarond280


    a question like this came up on a mock. Thanks :)


  • Registered Users, Registered Users 2 Posts: 1,160 ✭✭✭Eurovisionmad


    kingcobra wrote: »
    Welcome to Google Images my friend! :P

    Binoc03.gif

    That diagram is a bit . . . much all you need is two prisms reflecting through 180 and then maybe a lens on either side!


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    On question 12.b in the 2008 paper, it asks to calculate the change in pitch, but the question doesn't give you a value for the speed of sound? I thought it was 330 m/s so i used that but then the marking scheme used 340 m/s. The value for the speed of sound isn't in the log tables so and i wasn't sure what to use. I only used 330 cause i recalled seeing it in other questions on other years. usually they give you values like that but it can differ so how were we meant to know to use 340 instead of 330?


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 59 ✭✭Kingkumar


    umm it's always 340 in air ...i don't think it changes


  • Registered Users, Registered Users 2 Posts: 1,160 ✭✭✭Eurovisionmad


    Kingkumar wrote: »
    umm it's always 340 in air ...i don't think it changes

    Yes it does, it changes with temperature and pressure and a lot of other things!

    Have you checked the front page the value might've been printed there! Though if such a question comes up they would have to give the value as its not constant like the speed of light!


  • Registered Users, Registered Users 2 Posts: 1,988 ✭✭✭Monsieur Folie


    If ever you're stuck in an exam and you're convinced a value is not printed that should be, or you can't find a value in the log tables or you've forgotten one you're supposed to remember, it's probably better to make up a value and plow ahead picking up marks for method than to just leave it blank!

    Is this the physics thread now then? :P

    How is everyone set for this? Currently, I'd barely pass, but I have 5 days to whip it into shape and aim for a good B at least. Our mock was sh*t though. =/


  • Moderators, Education Moderators Posts: 26,403 Mod ✭✭✭✭Peregrine


    Kingkumar wrote: »
    umm it's always 340 in air ...i don't think it changes

    It changes with temperature, humidity, air pressure and many other things.

    For temperature the formula is:

    C = C0 + 0.60t

    Where C0 is the speed of sound at 0 degrees C, constant 331.5 m/s and t = the temperature


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    If ever you're stuck in an exam and you're convinced a value is not printed that should be, or you can't find a value in the log tables or you've forgotten one you're supposed to remember, it's probably better to make up a value and plow ahead picking up marks for method than to just leave it blank!

    Yeah that's what i was thinking as well but its not printed anywhere in the paper. I have no idea whats up with that they should give you it like

    How is everyone set for this? Currently, I'd barely pass, but I have 5 days to whip it into shape and aim for a good B at least. Our mock was sh*t though. =/

    I feel pretty confident. If i sat the paper tomorrow I'd probably get the A1 but I'm going to make sure i get it with a day worth of study on it


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 1,988 ✭✭✭Monsieur Folie


    Ah yeah. A nice paper would see me out nicely with an A1 alright but physics has always been my weakest science. I'd be happy with a B1 but after 5 days of hard work who knows, I might scrape the A :)


  • Registered Users, Registered Users 2 Posts: 97 ✭✭Raeral


    Anyone else planning to sit the paper without looking at electricity at all :P


  • Registered Users, Registered Users 2 Posts: 161 ✭✭Chikablam


    I absolutely hate Electricity. Nuclear stuff all the way!


  • Registered Users, Registered Users 2 Posts: 835 ✭✭✭kingcobra


    Our physics teacher left out the whole electricity section saying we don't need to do it :eek: I had to cover it through grinds. I've no idea what mark I could get either as we never did class tests so I don't know what standard I'm at, as with the others in the class. If I have a good exam I might scrape an A but I'm definitely looking for B.


    But lads, particle physics is where the craic's at :cool:


  • Registered Users, Registered Users 2 Posts: 60 ✭✭I_ENJOY_BATHS


    I really want an A1 but on all papers I do I end up just short of the 90% mark, what's the best thing to do for the last few days to maximise my chances of getting an A1?


  • Registered Users, Registered Users 2 Posts: 522 ✭✭✭Glee_GG


    Kingkumar wrote: »
    umm it's always 340 in air ...i don't think it changes

    It does change but our teacher told us for the purposes of the exam, they don't give you the value as your supposed to take it as 340m/s and just know it!


  • Registered Users, Registered Users 2 Posts: 522 ✭✭✭Glee_GG


    Need the A1, hopefully a decent heat/modern physics and particle physics question and I'll be set!


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    I really want an A1 but on all papers I do I end up just short of the 90% mark, what's the best thing to do for the last few days to maximise my chances of getting an A1?

    Do as many past paper questions as you can, focus on where your falling down so you can bring up the marks in the places your loosing them. Exam technique is essential.

    Don't waste time by doing past papers and correcting them to reassure yourself, bit of a waste of time at this late in the game. Just try to get exam focused so use past papers make sure you have good exam technique


  • Registered Users, Registered Users 2 Posts: 9 ItsCon


    Does anybody know if they're putting the values back on the paper or if we'll have to use log book again? There was a lot of problems last year with people taking values at different decimal places which gave a wide range of correct answers


  • Registered Users, Registered Users 2 Posts: 33 carlos123455


    Anyone has list of demonstrations we need to know for the exam?


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 1,026 ✭✭✭Leaving Cert Student


    ItsCon wrote: »
    Does anybody know if they're putting the values back on the paper or if we'll have to use log book again? There was a lot of problems last year with people taking values at different decimal places which gave a wide range of correct answers
    Ambiguous values such as speed of sound will be on paper. constants like speed of light may not be.


  • Registered Users, Registered Users 2 Posts: 22 worrx


    Looks like I'm the only one who'd be happy to even get a C! :P

    I'm leaving out mechanics because I find it extremely irritating!


  • Registered Users, Registered Users 2 Posts: 161 ✭✭Chikablam


    kingcobra wrote: »
    Our physics teacher left out the whole electricity section saying we don't need to do it :eek: I had to cover it through grinds. I've no idea what mark I could get either as we never did class tests so I don't know what standard I'm at, as with the others in the class. If I have a good exam I might scrape an A but I'm definitely looking for B.


    But lads, particle physics is where the craic's at :cool:

    What the hell was your teacher playing at? I hate it, but it's pretty big


  • Registered Users, Registered Users 2 Posts: 124 ✭✭curly135


    worrx wrote: »
    I'm leaving out mechanics because I find it extremely irritating!

    Every mechanics question I've ever done from the past papers has been a disaster, I'm steering clear of it :P

    A whole weekend for cramming before Physics, be grand. :pac:


  • Registered Users, Registered Users 2 Posts: 32 Brendan1234


    Does anyone know if we can take the speed of light as 3x10^8 ms-1 or do we have to use the value in the table books? I know for most constants you use the value in the table books but I think I saw in the 2011 or 2012 marking scheme that they used 3x10^8, thanks.


  • Registered Users, Registered Users 2 Posts: 11,553 ✭✭✭✭Copper_pipe


    G by Freefall or Co planer forces for Q1 i reckon


  • Registered Users, Registered Users 2 Posts: 178 ✭✭ynwa14


    I'm terrified of this exam I really need a C but I'd do anything to get higher than a B3. Anyone got any tips on revising/predictions? It's my weakest science but I'm sticking with HL so I really need a move on


  • Registered Users, Registered Users 2 Posts: 320 ✭✭lostatsea


    Anyone has list of demonstrations we need to know for the exam?

    Definitions, formulae, demonstrations, STS (pure gold): http://www.studentxpress.ie/Physics/L&Ssummary.pdf


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    lostatsea wrote: »
    Definitions, formulae, demonstrations, STS (pure gold): http://www.studentxpress.ie/Physics/L&Ssummary.pdf

    A lot of those definitions I've never seen before in my life. If we just learn all the definitions in Dan O'Regan's book should we be grand?


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 141 ✭✭HPMS


    lostatsea wrote: »
    Definitions, formulae, demonstrations, STS (pure gold): http://www.studentxpress.ie/Physics/L&Ssummary.pdf

    Never even knew that existed!! Thanks for that :)

    I'm hoping for an A but I still have electricity to revise but I have the weekend for that so should be grand. Considering the experiments go for so many marks, should hopefully have full marks there provided no sneaky questions are asked like the mocks! :)

    Any tips for getting the A? Is it just knowing definitions, how to the maths stuff and knowing how things work etc? Once you know all that, are you sorted?


  • Registered Users, Registered Users 2 Posts: 33 carlos123455


    HPMS wrote: »
    Never even knew that existed!! Thanks for that :)

    I'm hoping for an A but I still have electricity to revise but I have the weekend for that so should be grand. Considering the experiments go for so many marks, should hopefully have full marks there provided no sneaky questions are asked like the mocks! :)

    Any tips for getting the A? Is it just knowing definitions, how to the maths stuff and knowing how things work etc? Once you know all that, are you sorted?

    There's also few derriviations we have to know


  • Registered Users, Registered Users 2 Posts: 141 ✭✭HPMS


    There's also few derriviations we have to know

    Right, I knew that just forgot to put it in there! :)

    Don't you know for the STS part of the syllabus? Do you need to be able to describe the exact way everything works thats listed in that part of the syllabus? Like for the heat pump, do you need to know how it works? Or for mirages, do you need to know how they're formed? :)


  • Registered Users, Registered Users 2 Posts: 33 carlos123455


    HPMS wrote: »
    Right, I knew that just forgot to put it in there! :)

    Don't you know for the STS part of the syllabus? Do you need to be able to describe the exact way everything works thats listed in that part of the syllabus? Like for the heat pump, do you need to know how it works? Or for mirages, do you need to know how they're formed? :)

    I'm not sure about mirages but you have to know how the heat pump works, it has been asked at least once before. And they are fairly strict on the descriptions. For example, in the heat pump question if you didn't mention that the gas takes away LATENT HEAT from the cooler area you'd lose few marks. So if you just said it takes away heat or energy you wouldn't get full marks which I think is a bit harsh cause you're still showing that you know how it works :confused:


  • Registered Users, Registered Users 2 Posts: 914 ✭✭✭DarkDusk


    HPMS wrote: »
    Right, I knew that just forgot to put it in there! :)

    Don't you know for the STS part of the syllabus? Do you need to be able to describe the exact way everything works thats listed in that part of the syllabus? Like for the heat pump, do you need to know how it works? Or for mirages, do you need to know how they're formed? :)

    I'm pretty sure mirages came up before, I'd advise looking at them...


  • Registered Users, Registered Users 2 Posts: 141 ✭✭HPMS


    I'm not sure about mirages but you have to know how the heat pump works, it has been asked at least once before. And they are fairly strict on the descriptions. For example, in the heat pump question if you didn't mention that the gas takes away LATENT HEAT from the cooler area you'd lose few marks. So if you just said it takes away heat or energy you wouldn't get full marks which I think is a bit harsh cause you're still showing that you know how it works :confused:

    That is harsh... :confused: I was checking the syllabus, and it's so confusing, because it says for the STS sections (i.e. where the heat pump is) we only need to know the principle of them, not technical or operational details. It's so confusing regarding what we have to know!


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    What's STS?


  • Registered Users, Registered Users 2 Posts: 239 ✭✭sganyfx


    Undeadfred wrote: »
    What's STS?

    Science, Technology and Society.


  • Registered Users, Registered Users 2 Posts: 5,780 ✭✭✭jamo2oo9


    Anybody think that Joules Law will come up in Section A? My teacher is fairly confident that it will come up along with Concave Mirror, F=MA and either Specific Heat Capacity or Latent heat.

    He's also confident that photoelectric effect and capacitance will come up in Section B too.

    Anybody agree? I think Joules and F=MA will come up but the others I'm not so sure


  • Registered Users, Registered Users 2 Posts: 522 ✭✭✭Glee_GG


    jamo2oo9 wrote: »
    Anybody think that Joules Law will come up in Section A? My teacher is fairly confident that it will come up along with Concave Mirror, F=MA and either Specific Heat Capacity or Latent heat.

    He's also confident that photoelectric effect and capacitance will come up in Section B too.

    Anybody agree? I think Joules and F=MA will come up but the others I'm not so sure

    Mines going for coplaner forces for Q1 or g by freefall!


  • Registered Users, Registered Users 2 Posts: 11,553 ✭✭✭✭Copper_pipe


    Glee_GG wrote: »
    Mines going for coplaner forces for Q1 or g by freefall!

    Same with my teacher


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 33 carlos123455


    One of the heat experiments has to come up.. It hasn't came up in 2 years, and they're all fairly similar and easy :)


  • Registered Users, Registered Users 2 Posts: 141 ✭✭HPMS


    I would love a heat experiment, they're so easy to understand! I'm pretty sure the experiment to calibrate a thermometer has never come up so they might surprise us with that! :)


  • Registered Users, Registered Users 2 Posts: 320 ✭✭lostatsea


    HPMS wrote: »
    Right, I knew that just forgot to put it in there! :)

    Don't you know for the STS part of the syllabus? Do you need to be able to describe the exact way everything works thats listed in that part of the syllabus? Like for the heat pump, do you need to know how it works? Or for mirages, do you need to know how they're formed? :)

    My teacher says for the STS just read through the summary a number of times so you are familiar with the various terms - no need to learn them in detail like demos and definitions. The exception is the Heat pump that need to be learned in more detail.

    Most question on the STS section need one or two word answers.

    Derivations (proofs) are also included in the summaries.


  • Registered Users, Registered Users 2 Posts: 141 ✭✭HPMS


    lostatsea wrote: »
    My teacher says for the STS just read through the summary a number of times so you are familiar with the various terms - no need to learn them in detail like demos and definitions. The exception is the Heat pump that need to be learned in more detail.

    Most question on the STS section need one or two word answers.

    Derivations (proofs) are also included in the summaries.

    That's great, thank you! How do you know which ones in the STS to learn in detail? And which ones to not?

    My teacher is appalling so all she ever did was read through the book. Never explained anything. Completely ridiculous!


  • Registered Users, Registered Users 2 Posts: 320 ✭✭lostatsea


    HPMS wrote: »
    That's great, thank you! How do you know which ones in the STS to learn in detail? And which ones to not?

    My teacher is appalling so all she ever did was read through the book. Never explained anything. Completely ridiculous!

    The heat pump is the only one I'd study in detail. Read through the rest of them 3 or 4 times.


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    Is there anywhere online i could find the script of an A1 paper? I'd be useful in seeing the technique used in a 'perfect' paper


  • Registered Users, Registered Users 2 Posts: 204 ✭✭MarieCurie22


    kingcobra wrote: »
    Our physics teacher left out the whole electricity section saying we don't need to do it :eek: I had to cover it through grinds. I've no idea what mark I could get either as we never did class tests so I don't know what standard I'm at, as with the others in the class. If I have a good exam I might scrape an A but I'm definitely looking for B.


    But lads, particle physics is where the craic's at :cool:

    You can leave it all out once you know everything else!


  • Registered Users, Registered Users 2 Posts: 204 ✭✭MarieCurie22


    For those of you who have so much to do and little time....this website helped me a lot...brilliant quick and easy to learn


    http://thephysicsteacher.ie/leavingcertphysicsrevision.html


  • Registered Users, Registered Users 2 Posts: 301 ✭✭Undeadfred


    'Give two reasons why the thermistor is immersed in oil instead of water'

    This is in the 'measure restistance of a thermistor with temp.' question

    Answer?


  • Registered Users, Registered Users 2 Posts: 1,026 ✭✭✭Leaving Cert Student


    Undeadfred wrote: »
    'Give two reasons why the thermistor is immersed in oil instead of water'

    This is in the 'measure restistance of a thermistor with temp.' question

    Answer?

    oil is a poor coductor thermistor won't short...
    Dunno really


  • Advertisement
Advertisement