Recent content by Somali_Physicist

embarrassingly it was due to a picture from a random person. Looking at it now it doesn't make sense and i had no data to back it up. However from sources i think it should be : single crystalline > polycrystalline > amorphous (generally) To be honest i just needed a few sources to understand...

True, i was just assuming wrt to factors. so I'm assuming that polycrystalline would be more conductive as its more ordered.

Copper Bromide is around 3*10^3 S/m while copper ziroconium is around 500 S/m. Other data shows they are not extremely off.

How exactly does that help conduction ? If the electron wave extends throughout the crystal i don't see how that would help with the transport of electrons.

It is a simple guess, after reading Electronic Properties of Materials, 4th Edition i have found it is due to crystals having electron scattering being more coherent compared to their amorphous counterparts. However i am still abit confused , since polycrystalline is not a lot more conductive...

Hey guys basically why are copper crystals more conductive then the corresponding amorphous structure? I know generally that electrical conductivity is reliant on: σ = (e2 * (vf)2 n τ)/3 My attempt of understanding is that the crystal structures are made up of unit cells which implies every...

Because everything being zero normally means I am wrong.

For question 2.2: <Ψ0|p|Ψ0> = ∫Ψ0 -iħ d/dx(Ψ0) =M Using Integration by parts i get: M = -Ψ0 iħ d/dx(Ψ0) (assuming hilbert space) Implying the expectation values for momentum are zero , however i get all the expectation values are zero for x and momentum in both states which makes no sense :(

Wow! so this let's us do some neat trick thanks mate.

So the hilbert space in the case of spin-1/2 particles are 2 dimensional. And i am assuming a new hilbert space can be made for every observable. For instance if we have some X property which has 4 base states we can represent particles with X property construct an hilbert space of 4 dimensions...

I don't wish to be pedantic about this but isn't the hilbert space an infinite dimensional vector space? since the number of basis represent the dimension how can 2 = infinity?

But in the solution we represent the generic energy eigen vector as a linear combination of |+,x> and |-,x> spin basis states. |ψ> = a|+,x> + b|-,x> |ψ>(HMatrix) = c|ψ> : a,b, c are constants The first statement implies its made up of |+,x> and |-,x> basis states which implies that its an...

Hey Guys/Gals i understand the general premise of this question and can calculate the solution but i am a bit confused. I am supposed to represent a generic state as a linear combination of the |-,x> , |+,x> basis vectors. However i don't know why, is the question actually asking for the...

Thank you So there is no one liner equation ? What is your textbook called

This might sound stupid , but I am wondering how exactly could I describe the momentum eigenfunctions of photons? EDIT: to destroy ambiguity, I am searching for a quantum mechanic description of monochromatic light similar to how we represent it classically as: E-> = a->cos(wt+phi)