# Recent content by sreerajt

1. ### 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. ### 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. ### 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. ### 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. ### 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. ### I Integration of 1 variable in 2 different ways.

I made lot many mistakes.... thanks for pointing out... thank you...
7. ### 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. ### 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. ### Questions that i posted

Thanks sir...
10. ### 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. ### 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. ### 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. ### 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. ### 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. ### X-ray diffraction or reflection?

Okay.. Thank you.....