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  1. Jiyad Ahsan

    Physics: Post your doubts here!

    umm the mass of a neutron or a proton is given(something around 1.67x10^-27 kg)... so if they ask you to find the mass of lets say of carbon you know there are 6 protons and 6 neutrons so just add em.. like (6 x mass of proton) + (6 x mass of neutron)
  2. Jiyad Ahsan

    Physics: Post your doubts here!

    you do understand a halwa paper means a higher threshold... :(
  3. Jiyad Ahsan

    Physics: Post your doubts here!

    lol omg man.. :D
  4. Jiyad Ahsan

    Physics: Post your doubts here!

    2b(ii)2. umm you found out that the volume occupied by each atom is 1.8x 10^-23 so since volume is l^3 (l here being the diameter, though volume of a sphere isnt l^3 anyways,) so length is cube-root of volume Q4cii p.e = m.g.(change in)h 3.8 x (0.178-0.163) 0.057 J the other parts im still...
  5. Jiyad Ahsan

    Physics: Post your doubts here!

    umm basically you cant because since the stupid electron is accelerating velocity aint constant is it?
  6. Jiyad Ahsan

    Physics: Post your doubts here!

    why is it hard ? ok im going to try it.. lemme see
  7. Jiyad Ahsan

    Physics: Post your doubts here!

    http://www.google.com.pk/imgres?client=firefox-a&hs=3Vm&sa=X&rls=org.mozilla:en-US:official&biw=1440&bih=797&tbm=isch&tbnid=g9mJODrVrQ-cOM:&imgrefurl=http://9-4fordham.wikispaces.com/Electro%2BMagnetic%2BSpectrum%2Band%2Blight&docid=fwbuOLjfLxMH8M&imgurl=http://9-4fordham.wikispaces.com/file/view...
  8. Jiyad Ahsan

    Physics: Post your doubts here!

    righto mass of a person = around 70kg height of a person = 1.5m density of water = 300 cm^3 weight of an apple = 1N typical current in domestic appliances = 13 A e.m.f of a car battery = 12 V density of air at STP = 1.293 kg/m^3 since the wavelength and frequencies are related by V=freq. x...
  9. Jiyad Ahsan

    Physics: Post your doubts here!

    okay help me out on this one.. 9702/21/J/09, Q5 (b)
  10. Jiyad Ahsan

    Chemistry: Post your doubts here!

    ok so what you basically say is that since you need to only slightly oxidize an alcohol to an aldehyde you need a weaker oxidizing agent? because if its stronger like KMnO4 it'll oxidize it directly to carboxylic acid? right? did i get it right? similarly if i use LiAlH4 it'll convert an acid...
  11. Jiyad Ahsan

    Chemistry: Post your doubts here!

    okie dokie
  12. Jiyad Ahsan

    Chemistry: Post your doubts here!

    umm yeah that i sorta knew.. i was thinking .. like..Why is one stronger and the other not?..
  13. Jiyad Ahsan

    Chemistry: Post your doubts here!

    ok since nobody praises me i'm going to praise myself :p *talking to self* "you're getting an A!, no not 'an' A, 3 A's" note to self: "stop talking to self..."
  14. Jiyad Ahsan

    Chemistry: Post your doubts here!

    this one ^
  15. Jiyad Ahsan

    Chemistry: Post your doubts here!

    i guess i'll just google my question? :P
  16. Jiyad Ahsan

    Chemistry: Post your doubts here!

    whoa awesome you knew so much stuff i thought you'd be in A2 .. if not higher up :p
  17. Jiyad Ahsan

    Chemistry: Post your doubts here!

    yep thats right^ btw panda... i need a bit of help in organic chemistry we have oxidising agents KMnO4 and K2Cr2O7 and some reactions state using only one.. is there a difference? similarly LiAlH4 and NaBH4..
  18. Jiyad Ahsan

    Chemistry: Post your doubts here!

    it depends on what you're measuring.. you know.. if you're boiling something it doesnt matter much but if its like you're measuring specific heat capacity or something.. take accuracy at 0.5 degrees, then write in the additional details that a more accurate thermometer (0.1 degrees) would be...
  19. Jiyad Ahsan

    Chemistry: Post your doubts here!

    nope i saw it yesterday when we were at the maths forum :p it says female right there :p above lahore :) i can read lol
  20. Jiyad Ahsan

    Chemistry: Post your doubts here!

    lol its a goodthing im giving three accel's i can help everyone out, btw daredevil everyone mistakes you for a guy dnt you get tired of it :p
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