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    (Original post by Zain.chishty)
    The question said the atoms were less than 100 in the width so i used 99
    Less than 100 could be 98, 97, 21, 87


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    (Original post by Mutleybm1996)
    For resolution I just did image size/ magnification/ how many pixels

    Not sure if that's right


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    no you have to use the actual distance represented by the image, not the one measured by a scale.
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    (Original post by Zain.chishty)
    what did you get for the resolution of the image. was it 270 pm * 99 and than divided by 500
    I didnt get * 99 i got * 50 because i measured each diameter as 1 mm and whole picture as 50 mm wide so 50 atoms which were 270pm diamter each then divided by 300 pixels, I think should be same answer but i used the height of the picture whereas you used the full width?? i dont remeber answer i got tbh but should be fine i think we used same method
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    (Original post by Zain.chishty)
    no you have to use the actual distance represented by the image, not the one measured by a scale.
    Yeah so Actual=image/magnification , then divide that by the number of pixels


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    (Original post by vish.handa)
    I didnt get * 99 i got * 50 because i measured each diameter as 1 mm and whole picture as 50 mm wide so 50 atoms which were 270pm diamter each then divided by 300 pixels, I think should be same answer but i used the height of the picture whereas you used the full width?? i dont remeber answer i got tbh but should be fine i think we used same method
    Should be a really small number any way


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    (Original post by jpetersgill)
    Did u find the diameter of one atom?


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    It gave you it in the question i think, like 270 pm??
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    (Original post by vish.handa)
    I didnt get * 99 i got * 50 because i measured each diameter as 1 mm and whole picture as 50 mm wide so 50 atoms which were 270pm diamter each then divided by 300 pixels, I think should be same answer but i used the height of the picture whereas you used the full width?? i dont remeber answer i got tbh but should be fine i think we used same method
    Finally someone else who got diameter = 1mm


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    (Original post by Mutleybm1996)
    Yeah so Actual=image/magnification , then divide that by the number of pixels


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    to find actual size you need magnification.
    How would u find magnification ? image size/ actual size

    and the question gives the diameter of one atom and says that in width the image has less than 100 atoms
    so actual size = diameter of one atom * the total number of atoms
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    Peeps, is it still possible for me to get an A overall if I say get a C in this? By e.g getting 100 ums in unit 2?
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    (Original post by jpetersgill)
    Finally someone else who got diameter = 1mm


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    It said measure it so i just used my ruler... what did others get?
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    (Original post by Zain.chishty)
    to find actual size you need magnification.
    How would u find magnification ? image size/ actual size

    and the question gives the diameter of one atom and says that in width the image has less than 100 atoms
    so actual size = diameter of one atom * the total number of atoms
    Yes
    But it didn't say HOW MANY atoms


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    (Original post by Mutleybm1996)
    Should be a really small number any way


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    i measured the diameter as 0.8cm from the image then did 0.8cm/270pm
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    (Original post by vish.handa)
    It said measure it so i just used my ruler... what did others get?
    So did I but if you count the spaces between the bright spots you get 2mm (which many did) whereas you and I just measured the bright spots' diameters


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    (Original post by Mutleybm1996)
    Yes
    But it didn't say HOW MANY atoms


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    the way the question was set up , saying less than 100 atoms , it implied as if one less than a 100
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    (Original post by vish.handa)
    It said measure it so i just used my ruler... what did others get?
    i got it as about 0.8cm as there was a faint circle surrounding the white dot which represents the atm, so that was 0.8cm
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    (Original post by Zain.chishty)
    the way the question was set up , saying less than 100 atoms , it implied as if one less than a 100
    If it wanted you to use 99 it would have said 99...........


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    (Original post by HennersPD)
    i measured the diameter as 0.8cm from the image then did 0.8cm/270pm
    That sounds about right
    I didn't spot that
    Might get some method marks for the formulae though


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    (Original post by jpetersgill)
    So did I but if you count the spaces between the bright spots you get 2mm (which many did) whereas you and I just measured the bright spots' diameters


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    I'm not sure measuring it was the right way to go to be honest especially if it's that ambiguous


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    (Original post by jpetersgill)
    So did I but if you count the spaces between the bright spots you get 2mm (which many did) whereas you and I just measured the bright spots' diameters


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    Ah right fair enough yeah i did the diamter of the dots too but whoever is wrong , there will proably be a mark for allow 2mm or something
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    (Original post by HennersPD)
    i got it as about 0.8cm as there was a faint circle surrounding the white dot which represents the atm, so that was 0.8cm
    0.8cm as in 8 mm??? that seems quite large or do you mean 0.8mm? if so i got 1mm which is close to that ?
 
 
 
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