# Recent content by deep838

1. ### I Interpreting "momentum" in WKB approximation

Yeah I understand the interpretation regarding velocities... What's bothering me is the one regarding wavelengths.
2. ### I Interpreting "momentum" in WKB approximation

According to WKB approximation, the wave function \psi (x) \propto \frac{1}{\sqrt{p(x)}} This implies that the probability of finding a particle in between x and x+dx is inversely proportional to the momentum of the particle in the given potential. According to the book, R. Shankar, this is...
3. ### GRE with 3 years of Bachelors degree?

Hi, I am currently in my 3rd and final year of B.Sc Physics. Soon I'll have to start applying for a Masters degree. Is it true that you need 4 years of bachelor degree to get admitted for Postgraduate via GRE exam? If so, is there any university outside India which will accept my 3 year course...
4. ### Clarification about stationary quantum states of a system

I see... thank you for replying so early... Yes I kind of knew that ## \frac{\partial \psi}{\partial t}=0 ## is wrong... but in that short period of time I didn't even try to think... please don't start criticizing me for that...
5. ### Clarification about stationary quantum states of a system

Okay, here goes... Our teacher set a question in the last test which asked us to show that if a system initially be in a stationary state, it will remain in a stationary state even if the system evolves according to the time dependent Schrodinger equation. What I did was show that the...
6. ### Gauss' Law in a dielectric material

Okay. That was helpful. Thank you everyone for helping me with this. I have a better understanding now.
7. ### Gauss' Law in a dielectric material

. I agree to that and have understood this part. . This is what I'm talking about. Of course we have polarization charges on the surface and its the normal component of P... So why do we not bring it in the divergence equations?
8. ### Gauss' Law in a dielectric material

This part is alright, what's bothering me is that we are nowhere bringing the surface charge density in this derivation. Why is that? Or is it hiding somewhere!
9. ### Gauss' Law in a dielectric material

This is what we have in text-books and in Wikipedia: ρ=ρb+ρf and from there we get ∇.D=ρf. But I am unable to understand why we are not considering the bound surface charge in deriving this equation. Can anyone explain this to me.
10. ### Is the Moment of Inertia strictly different

Yes, but is that value strictly different for two different bodies? Or can two mass distribution have the same moment of inertia?
11. ### Is the Moment of Inertia strictly different

I mean to say that the bodies are not 2 dimensional, they only have length.. Like a rope. Only the distribution is not continuous, it is made of a number of masses
12. ### Is the Moment of Inertia strictly different

I would like to know if there is any proof as to whether the moment of inertia for two bodies (the masses of each body are distributed on a line) about their respective center of masses, is strictly different. If not, can anyone provide me a link to where the work is computed.
13. ### Width of a wire grid polarizer

how does that reduce the scattering of light.?
14. ### Width of a wire grid polarizer

Why is it that the width of a wire grid polarizer has to be less than the wavelength of the wave which I want to polarize? What would happen if the width was a little bit more?
15. ### Kelvin's thunderstorm generator

Ok... Now I understand what's going on! The fact that nothing is perfectly neutral is being exploited here. That's pretty clever actually... :D