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  1. Z

    Can anyone help me asap! chem p4!

    Re: Chemistry p4! There is no reaction because the E cell is negative. Fe3+/ Fe2+ magnitude is smaller than Cl2/2Cl-. So, the overall E cell would be negative
  2. Z

    can any one please help me with this phy p4 question

    The mark scheme is just plain wrong! However, the mark scheme does demonstrate that the net work done is 0.
  3. Z

    intensity of ultrasound!! phy app

    Oh, sorry . Should have read the question more carefully! The question basically involves absorption on two occasions and reflection on one occasion. First , when the wave passes through the 3.5 cm of muscle, use the absorption coeff. formula I1/I = exp(-kx)= exp (- 3.5 x 0.23) =0.4471 I1=...
  4. Z

    Wavebands

    thanks but I wanted to know is why can't we use MW or LW for FM transmission
  5. Z

    intensity of ultrasound!! phy app

    It may be helpful to think of the equation in terms of the radioactive decay. You may notice that there is a striking similaritiy between the two. You can take the intensity to be the no. of undecayed nuclei and k(absorption coefficient) to be the decay constant. Thinking in those terms, all...
  6. Z

    2010 nov ERs

    Thanks man!
  7. Z

    CT scan

    But Diwash says that it creates a 2D image which are combined to form a 3D image. What I wanted to know is the difference between the 2D formed in this and 2D formed in a simple X-ray photographic plate
  8. Z

    Wavebands

    Thanks for the app. booklet but i already had one. I got those questions on reading the bookelt
  9. Z

    CT scan

    So, what is the difference in the 2D image produced by CT scan and the 2D image produced by X-rays on a photographic plate?? After all, both are both are 2D
  10. Z

    Wavebands

    What does long wave (LW) wavebands and short wave(SW) wave bands mean in telecommunication :cry: Also, why does AM use LW and SW waveband while FM transmission use Very High Frequency (VHF) waveband for transmission as carrier waves?
  11. Z

    Phy paper 4

    All you need to keep in mind for this question is that emf induced is the gradient of the curve of It (the upper curve) Suppose the four vertical lines after t=0 are : t=t1, t=t2, t=t3, t=t4 For t=0 to t=1, the emf is 0. So, a line than is on the X axis needs to be drawn At t=t1, current starts...
  12. Z

    CT scan

    "Repeted images from each slice produces a 3 dimensional image , which can be viewed from different angles". What does "repeated images from each slice" mean here?? Plus are we using the repeated 2D images of a slice to build up the 3D image of the slice itself?
  13. Z

    Maths paper 3 (MAY june 10 paper 31)URGENT!!

    Thanks man, I too had been wondering for some time now!
  14. Z

    CT scan

    After reading the application booklet, I have somehow cobbled up this answer. Please rectify my mistakes and suggest improvements to the answer: CT scan builds a 3D image of a body by constructing 3D image of many slices through the body. Each section of a body is divided into voxels by a...
  15. Z

    CT scan

    Can anyone please explain to me the principles of CT scanning??
  16. Z

    2010 nov ERs

    I need them to Mine is: [email protected]
  17. Z

    O/N 2010 P63 Q. no.: 6 (ii) and (iii)

    Thanks, I figured as much! What screwed me up totally was the third part!!!!
  18. Z

    Biology study guide

    Do you, by any chance, have similar resources for physics and chemistry too?
  19. Z

    Biology study guide

    Thank you for the link!!!!! It does work: http://depositfiles.com/en/files/u2nlaaw9u
  20. Z

    Biology study guide

    plus some resource that gives a proper idea of "hypothesis testing" as required by the CIE biology syllabus
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