Imagine a box designed to make vacuum state inside. Is it possible for us to lock the photons up inside something completely enclosed?

I'm interested in using normal "Reynolds wrap" type aluminum foil as a radiant barrier. What are some measures of how much light and heat this would reflect under ideal and "normal" conditions? Are there significantly better types of foil out there? How much better-performing are the products des...

Why Is there no effect in the mass of the bob on the period of the simple pendulum? I have found out many different explanations. However, I wasn't able to find a scientific explanation for my research proposal.

I have found that the Coulomb force in two dimension varies with $\frac 1 r$: \begin{equation}\tag{2}F=\frac{1}{2\pi\epsilon}\cdot\frac{q_1q_2}{r}\end{equation} But I was not able to prove it. I think it can be proved using the Laplace equation and other further modifications. One question relate...