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  1. sreerajt

    What makes a door move, the torque or the force or both?

    May be a relevent read: Leo Rausér's answer to Why exactly is it scientifically impossible to lift someone up by the neck? How strong do you have to be to do so? - Quora
  2. sreerajt

    A Small & large argument expansion of plasma dispersion function

    Thanks you for the reply. Seems like I am not the only one who has this doubt :smile: ...
  3. sreerajt

    A Physical significance of growth rate in plasma

    This kind of graph appears at many places where one invoke kinetic theory to study plasma. E.g. kindly see research article at...
  4. sreerajt

    A Physical significance of growth rate in plasma

    Let us say that we have a dispersion relation curve and associated instability curve as shown below for a magnetised plasma, which have been formulated through kinetic theory. The frequencies and growth rate have been normalized w.r.t. cyclotron frequency of proton. My question is: what does...
  5. sreerajt

    A Small & large argument expansion of plasma dispersion function

    In plasma physics we have what is known as plasma dispersion function. There are two approximation under which this function can be expanded: when the argument is less than 1, we can use power series expansion and when the argument is greater than 1 we can have asymptotic expression. My...
  6. sreerajt

    I Integration of 1 variable in 2 different ways.

    I made lot many mistakes.... thanks for pointing out... thank you...
  7. sreerajt

    I Integration of 1 variable in 2 different ways.

    OMG :nb). Ya, that's correct. But, if P and V is a function of x, then ??? Infact i did that calculation keeping this in mind that P and V is a function of x.
  8. sreerajt

    I Integration of 1 variable in 2 different ways.

    I have to do a integration which goes like this: (V-M)(dP/dx)+3P(dV/dx)=0, (where M,P and V are constants). If you integrate with dx, you will get: ∫[(V-M)dP]+∫[3PdV]=0. which ultimately results in the answer M=4V. Now, i can put the first equation in this form also...
  9. sreerajt

    Questions that i posted

    Thanks sir...
  10. sreerajt

    Questions that i posted

    hello... i was using physics forum 1 year ago and i used to post some questions and some answers also. Now i would like to have a look on those older stuffs. But, i searched, in vain, extensively in PF. Can anyone guide me through this??? Thanks in advance...
  11. sreerajt

    Integrating sine where argument goes to infinity.

    i understand that sir. But, when you do the maths it comes into picture. And this is why i posted the question here. Thank you...
  12. sreerajt

    Integrating sine where argument goes to infinity.

    Okay. i am trying to derive a dispersion relation in magnetized plasma with kinetic approach. By the by i am taking only two terms, just forget about the last term in the above equation. We will encounter a term##I= \int_0^\infty cos(\phi-\phi')e^{g_1(\phi')}\,d\phi'\\## where ##g_1(\phi')= i...
  13. sreerajt

    Integrating sine where argument goes to infinity.

    After some integration, i am getting a form e^{i \alpha\phi+i\beta\phi\sin(\phi-\phi')-i\gamma\sin\phi} , where ##\alpha, \beta, \gamma## are constants. Now i want to apply the limit where ##\phi ## ranges from 0 to ##\infty ## (ya, in the argument of sine we will encounter ##\infty ## which is...
  14. sreerajt

    Difference between generating function and Rodrigue's formula?

    i saw this link before posting this question. but i don't think that it contain answer to my question....
  15. sreerajt

    X-ray diffraction or reflection?

    Okay.. Thank you.....
  16. sreerajt

    Difference between generating function and Rodrigue's formula?

    What is the difference between generating function and Rodrigue's formula? Some says that from generating function you can generate required polynomial (say for example from generating function of Legendre polynomial you can get Legendre polynomial.), but in that case,as far as i know, Rodrigues...
  17. sreerajt

    X-ray diffraction or reflection?

    You (actually Wikipedia :wink:) are telling is that reflection ".... producing a diffraction pattern of regularly spaced spots known as reflections". But reflection is a physical phenomenon, so how cold you term spots as reflection??
  18. sreerajt

    X-ray diffraction or reflection?

    does anybody have any other answer????
  19. sreerajt

    X-ray diffraction or reflection?

    In x-ray diffraction , even though its reflection is happening , we call this as x ray diffraction. why is it so?? i don't know whether it has been discussed previously here.
  20. sreerajt

    PF is getting a face lift!

    All the best...
  21. sreerajt

    Extensive and intensive quantities

    What are the difference between extensive and intensive quantities?
  22. sreerajt

    What does paradox mean?

    "A paradox is an argument that starts with apparently acceptable assumptions and leads by apparently valid deductions to an apparent contradiction." by Quantum Paradoxes: Quantum Theory for the Perplexed by Yakir Aharonov, Daniel Rohrlich.
  23. sreerajt

    Space- Time Unification

    Thanks Ibix .. that was a nice one....
  24. sreerajt

    Space- Time Unification

    sorry for that... What are the old and new concepts about space and time?
  25. sreerajt

    Space- Time Unification

    What does actually mean by the saying that Einstein united space and time?
  26. sreerajt

    Diagonalizable matrix

    The second question in that link gives us 3 eigenvalues in which 2 of them are equal. But the diagonalized matrix has no change.????
  27. sreerajt

    Lowest possible temperature

    sorry... What? what does that last sentence says?
  28. sreerajt

    System in lowest energy sate

    Say for example this: why does a (electric/magnetic)dipole placed in external electric/magnetic field align itself parallel to the field. Why?
  29. sreerajt

    Lowest possible temperature

    it was a small mistake 0C meant degree centigrade.. i heard that it stems out from Charles's law
  30. sreerajt

    System in lowest energy sate

    imbalance of what?
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