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  1. S

    Chemistry: Post your doubts here!

    thank you so much for that clear explanation!! really helped :)
  2. S

    Chemistry: Post your doubts here!

    Hello! I have doubts in question 1 of this paper http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9701%20-%20Chemistry/9701_w04_qp_4.pdf A) Why is the concentration of H2SO4 halved in q1 a (ii)?? Mark scheme: (pH = 0.70) ⇒ [H+ ] = 10-0.7 = 0.20 (mol dm-3) [1] ∴ [H2...
  3. S

    Physics: Post your doubts here!

    I cannot thank you enough for this explanation!! I finally understand it, god bless you :)
  4. S

    Physics: Post your doubts here!

    It is communicating information
  5. S

    Physics: Post your doubts here!

    QUESTION: An optic fibre has a signal attenuation of 0.20 dB km–1. The input signal to the optic fibre has a power of 26 mW. The receiver at the output of the fibre has a noise power of 6.5 µW. Calculate the maximum uninterrupted length of optic fibre given that the signal-to-noise ratio at the...
  6. S

    Physics: Post your doubts here!

    Q. A small ball moves from rest down plane RA and then rises up plane LA. It then moves down plane LA and rises up plane RA to its original height. The motion repeats itself. State and explain whether the motion of the ball is simple harmonic. A. mark scheme says "acceleration is constant...
  7. S

    Physics: Post your doubts here!

    http://studyguide.pk/Past%20Papers/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w09_qp_42.pdf please help me with question 3(c) [ the answer on the mark scheme is - straight line between(-0.3,+190) and (+0.3,-190)] I don't know how they got 190 ms^-2 as the y coordinate...
  8. S

    Physics: Post your doubts here!

    thank you so, so much!!
  9. S

    Physics: Post your doubts here!

    http://papers.xtremepapers.com/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w12_qp_43.pdf question 1bii) HELP PLEASE! I don't understand how they got mass as 1.66x10^-7 (other than that I understand everything) thanks a lot in advance!
  10. S

    Chemistry: Post your doubts here!

    thank you very much!! And I will see to it that the stated details are included
  11. S

    Chemistry: Post your doubts here!

    The numerical value for Ksp is 2.00 x 10–11. Calculate [Mg2+(aq)] in a saturated solution of Mg(OH)2. Please help, I dont understand the mark scheme
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