Recent content by Youyang Zhao

Does that mean by mathematical calculation, we can get the result that the standard deviation of the kinetic energy equals to Δp^2/2m, which is smaller than the average value of the kinetic energy?

It is in the IB textbook. Said as an application of the uncertainty principle, consider an electron, which is known to be confined in a region of size L. We know the uncertainty in position of the electron must satisfy Δx<L. Therefore, according to the uncertainty principle, we can work out...