Oh gosh oh I see it in my life face and
The De Broglie wavelength of the electron is

And we can use De Broglie's relationship to find its momentum:

Given

, with m being the electron mass and v its velocity, we can find the electron's velocity:

This velocity is quite small compared to the speed of light, so the electron is non-relativistic and we can find its kinetic energy by using the non-relativistic formula:
<span>Closed systems, are held to be isolated from their environment. Equilibrium thermodynamics, for example, is a field of study that applies to closed systems.</span>