2:06 PM
3

In non-relativistic Quantum Mechanics, energy can be interpreted as a frequency in time, and momentum as a frequency in space. In Special Relativity, Energy turns out to be the temporal component, and momentum, the spatial component of the four-momentum vector. These two are very unrelated theori...

2:56 PM
2

I've learnt quantum field theory for a semester but I still can't understand the role of classical equation of motion in QFT. I have looked up for several books. They all discuss classical field theory. And they turn to the quantum part without leaving comments. It seems the following things have...

7 hours later…
10:07 PM
2

Consider two parallel plate capacitors, one with a separation between plates of $d_1$ and other with $d_2$, where $d_1,d_2<<\sqrt A$ and where $A$ is the area between the plates and both in the same medium. Now let dielectric strength of material be $E$, therefore the maximum possible electric fi...