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  1. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    you're welcome Bro!
  2. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    i didn't get you!
  3. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    yes.... diffraction is the bending of waves around the edges of a hard surface if the gap between the blocks is wider then it will pass as lines with slight deflection at edges but narrowing it making the lines circular diffraction doesn't change speed wavelength or frequency of waves, only its...
  4. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    yes for waves diffraction but interference is for Al students only :D
  5. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    yes if he is asking to find the critical angle of the medium but i think it is better to use sinc=1/n
  6. Karim Nabil

    Iɴғᴏʀᴍᴀᴛɪᴏɴ ᴀɴᴅ Cᴏᴍᴍᴜɴɪᴄᴀᴛɪᴏɴ Tᴇᴄʜɴᴏʟᴏɢʏ (0417) : Pᴏsᴛ ʏᴏᴜʀ ᴅᴏᴜʙᴛs ʜᴇʀᴇ! ᴴᴰ

    no -_-
  7. Karim Nabil

    CIE Oct/Nov 2013 papers with marking schemes

    http://papers.xtremepapers.com/CIE/Cambridge%20IGCSE/Geography%20(0460)/
  8. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    you're most welcome!
  9. Karim Nabil

    A level Biology: Post your doubts here!

    q30>>record the diffence in time between (1 and 2) (3 and 4) and add them together 0.035+0.04=0.075s so the answer is C q31>>cartilage present in trachea and bronchus only so answer maybe B or D goblet cells is not present in alveoli so last option is D answer=D
  10. Karim Nabil

    A level Biology: Post your doubts here!

    amino acid=3 nucleotides in DNA we have double strand, one sense strand carrying all info. and other anti-sense strand that is only complementary strand used to stabilize DNA molecule so we divide 6000 by 2 as only one strand is carrying info.=3000 1 amino acid= 3 nucleotides x amino acid= 3000...
  11. Karim Nabil

    Arabic edexcel as a first language Anyone ?

    to take lesser time in writing (t3ber) you have to read the question carefully even if it takes 5 minute from your time on a separate paper start writing main points related to that article(adv.,disadv,consequences.etc...), key words are just more than enough start to write based on your...
  12. Karim Nabil

    Arabic edexcel as a first language Anyone ?

    ISA, JUST KEEP CALM AND SOLVE AS MANY PASTPAPERS AS YOU CAN :)
  13. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    my pleasure! ;)
  14. Karim Nabil

    Arabic edexcel as a first language Anyone ?

    yes i am serious, this is your way to an A*- work harder so your A* becomes easier to achieve anyways, yes allah ynawar 3leki t3berat heya idioms zy t4beh w elbla8a w kda y3ni :P
  15. Karim Nabil

    Biology; Chemistry; Physics: Post your doubts here!

    here is a link i think it will helps you :D ! http://www.s-cool.co.uk/gcse/biology/environment/revise-it/cycling-through-nature
  16. Karim Nabil

    By the time you learn the rules of life, you’re too old to play the game.

    By the time you learn the rules of life, you’re too old to play the game.
  17. Karim Nabil

    English (0510) LISTENING TRACKS oct/nov 2013

    your most welcome sis!
  18. Karim Nabil

    English (0510) LISTENING TRACKS oct/nov 2013

    http://www.hanaawahba.com/production/pastexams/Cambridge/Cambridge.php
  19. Karim Nabil

    PHYSICS (0625) past papers 1999-2001

    last batch :P
  20. Karim Nabil

    PHYSICS (0625) past papers 1999-2001

    much more......
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