All Questions

Context: I'm thinking about QFT here and why introducing a momentum cutoff means ignoring short distances. This has been asked before (Why are high energies equivalent to short distances?) but I didn'...

Say we throw a ball from a height of $10$ m, $10$ degrees, at $12$ m/s. The x-component of the velocity vector is $12\cos(10)$ m/s and the y-component is $12\sin(10)$ m/s. From the kinematic ...

In Group Theory: Applications to the physics of condensed matter, eq. 9.15, Dresselhaus gives the following proof that the translation group is a normal subgroup of the space group: \begin{align*} \{...

I'm working on some problem and would like some help : I tried to find some values in google, but I couldn't find any result. what is the values of diffusion coefficient in case of Xenon,Argon,and ...

Let me preface this question by saying that I've only taken mathematics through Calculus II and the first general physics class offered at my university, so the methods necessary to solve this problem ...

To preface, I'm not a physics major so I've never taken a QFT class before. But I'm working on something that requires me to find the amplitude of that following Lagrangian: $$ \mathcal{L} = -\frac{1}...

The figure shows two sets of water waves, created by two sources labeled "A" and "B." The solid half-circles represent wave crests from A, and the dashed half-circles represent wave crests from B. ...

If a spring is initially compressed a distance x by a mass M, at what stage should I consider potential energy to be present? I know that $E_{initial} + W_{NC} = E_{final}$, but since there are no non-...

I'm just starting to learn about shear stress/shear rates for fluids, and I'm trying to get the concept right in my head. Is it that the shear stress is caused by frictional interaction with another ...

In this article it is written that the packing percentage of randomly packed spheres is about 64%. Now picture a cubic box filled randomly with these spheres. When we shrink the vertical dimension, ...

A photon of wavelength λ collides with a photon of frequency f. Given λ, find the frequency f for which a pair of electron-position at rest in the center-of-mass frame is created from the head-on ...

If the graviton causes the gravitational attraction between massive particles, could the theoretical anti-graviton have the opposite effect that pushes massive particles apart? Would the graviton even ...

We often see the statements that a violation of Bell inequality means that the system shows quantum behavior or that a Local hidden variable theoretic description is not possible. One also finds that, ...

I want to get in quantum computing but, i do not have any knowledge in quantum mechanics or the mathematics needed for this kind of field i just know how to program stuff( in mathematics i just know ...

I am in the process of trying to find out the potential of a uniformly magnetized sphere with radius $a$. What I need to work out is the following: $$\int\int\frac{d\vec{S} }{|\vec{r}-\vec{r'}|}$$ ...