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  1. Prashasti

    Sex linked diseases and lyonization in females

    Suppose, there's a disease "D", which is an X-linked, dominant disease. Now, there's a female who possesses the allele for this disease in one of her two X chromosomes. (XDX) It's easy to say that since the allele for the disease is dominant, she'll suffer from it. Now, it's a well known fact...
  2. Prashasti

    Course of the Optic Nerve

    We had a class on optic nerve today. Our teacher said that the optic nerve "originates" from the retina, and continues up till the commencement of the optic chiasma, and is, approximately, 4 cm long. My question is, Why is it considered to be a cranial nerve when it does not even originate...
  3. Prashasti

    Question related to molarity

    No. I'm in high school. So, I don't know much about that. What specific situations are you talking about? .
  4. Prashasti

    Question related to molarity

    Ammonia gas is passed into water, yielding a solution of density 0.93 g/cm^3 and containing 18.6% NH3 by weight. The mass of NH3 per cc of the solution is 1) 0.17 2) 0.51 3) 0.34 4) 0.68 I solved it using the molarity equation. Molarity = 10xd/MM where, x - % by weight d - density MM -...
  5. Prashasti

    Convex lenses

    Ahh! I got it! Power is inversely related to focal length. Now, because the combination is "more" converging (more power), its focal length will be less. :headbang: I think it's correct now. Thanks! :oldsmile:
  6. Prashasti

    Convex lenses

    Homework Statement A thin double convex lens of focal length f is broken down into two halves at the axis. The two haves are then combined, as shown in the figure. What will be the focal length for the arrangements...
  7. Prashasti

    Relative stability of ortho and para isomers

    Generally, in organic reactions, the para isomer is found to be more stable (as it is symmetrical) because of which it is produced in greater amount than the ortho isomer. However, there are some exceptions also, for example, in some reactions the less sterically hindered ortho isomer is...
  8. Prashasti

    Dipole in an external electric field

    The direction of the resultant of A x B is just opposite to that of B x A...
  9. Prashasti

    Dipole in an external electric field

    Homework Statement Why isn't the expression for torque on a dipole kept in an external electric field ExP? Why is it PxE? No such indication has been given in any of the derivations, that it is mandatory for it to be PxE, so why can't it be ExP? 2. The attempt at a solution Is it all about...
  10. Prashasti

    Kirchhoff's Loop Rule Problem.

    So, the mistake lies in that "assumption" itself. It messed everything up. Thanks a lot!
  11. Prashasti

    Kirchhoff's Loop Rule Problem.

    What would have happened if there was a question with the same circuit diagram and a cell with emf (E) 12 V was present there?
  12. Prashasti

    Kirchhoff's Loop Rule Problem.

    No. I added it myself..
  13. Prashasti

    Kirchhoff's Loop Rule Problem.

    No, only the portion of the figure between the points A and D has been given. But, I've assumed E > 3V.. So the current will pass according to the cell with emf 'E' only? Am I right?
  14. Prashasti

    Kirchhoff's Loop Rule Problem.

    Homework Statement Actually, the main question is to find out the potential difference between the points 'A' and 'D'. The cell with emf 'E' has not been shown in the main question, but I have assumed it to be connected between 'A' and 'D'. Each resistor is of 1 Ohm. 2. The attempt at a...
  15. Prashasti

    Amplitude Modulation of a wave

    They mentioned the result before deducing the expression for the same. I got it! Thanks!!
  16. Prashasti

    Amplitude Modulation of a wave

    Ok. So, the problem lies in the arrangement of all that in my textbook..
  17. Prashasti

    Modulation of waves (Communication Systems)

    And please help me with my first question too...(marked as 1) in the original post). If this question seems to be pointless - then please explain the working of a transducer..Since It's not clear to me. Is an electrical transducer used only in the case of a communication system involving cables...
  18. Prashasti

    Modulation of waves (Communication Systems)

    I got the point. But still I think I didn't get the answer of the 'original' question. Actually, I'm trying to say that in the second diagram, all the oscillations are confined to one quadrant only - I mean, the wave is not "crossing" the time axis...Whereas in the first one, it can be seen...
  19. Prashasti

    Modulation of waves (Communication Systems)

    Please look at the attachments below. I shall use the word "modulation" instead of "amplitude modulation" since I've been taught about AM only. So, my question is, in the first image (that I've attached), the messenger wave (which is modulated with the high frequency carrier wave) as well as...
  20. Prashasti

    Amplitude Modulation of a wave

    Homework Statement I am utterly confused. When I was reading my textbook , I found something unacceptable. While deriving an expression for a modulated wave, It's been given that "A sinusoidal carrier wave can be represented as c (t) = Ac sin (ωt + Φ) where c (t) is the signal strength of...
  21. Prashasti

    Magnetic field inside a Solenoid

    Well, my teacher has been using that formula... The application of the Biot Savart Law on the centerline of a current loop involves integrating the z-component. The symmetry is such that all the terms in this element are constant except the distance element dL , which when integrated just...
  22. Prashasti

    Magnetic field inside a Solenoid

    Homework Statement Can I derive an equation for magnetic field inside a solenoid using the formula for magnetic field on the axis of a current carrying coil? Homework Equations B = μI/2r ( Magnetic field at the centre of a current carrying coil) The Attempt at a Solution B = μI/2r Let the...
  23. Prashasti

    Young's Double Slit Experiment refraction

    Sorry, I didn't quite understand the point. Can you explain it diagrammatically?
  24. Prashasti

    Fraunhofer Diffraction Doubt

    I 'm talking about the second lens...
  25. Prashasti

    Fraunhofer Diffraction Doubt

    Does it mean why my teacher did was wrong?
  26. Prashasti

    Fraunhofer Diffraction Doubt

    Homework Statement A monochromatic source of light 'S' is placed at the principal focus of a convex lens 'L1'. A parallel beam of light or a plane wave front is incident on the narrow slit represented by AB (its width - 'a') Homework Equations So, what my teacher did was, She showed...
  27. Prashasti

    Young's Double Slit Experiment refraction

    No. Lateral displacement is "must", because the two media are with different refractive indices. They won't "cancel" each other's effect...rather, the emerging ray will follow a different path. (I'm pretty sure about this)
  28. Prashasti

    Young's Double Slit Experiment refraction

    Homework Statement Young's double slit experiment 'd' - Separation between the two slits 'D' - Separation between the double slit and the screen 'S' - Source (Primary) (It is coherent) S1, S2 - Secondary sources Δx - Path difference between the two rays coming out from S1 and S2 Δx° - Path...
  29. Prashasti

    Stability of carbocations and inductive effect

    Which carbocation is more stable? 1) CH3-C+=CH2 2) CH3-CH+-CH3 Basically, I want to know whether the =CH2 group is electron donating or electron withdrawing. Does it show +I effect like alkyl groups? I mean, like in 2) the carbocation will get stabilised due to the electron donating power of...
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