Why is the Heisenberg uncertainty principle true at the atomic level?

The Heisenberg uncertainty principle explains why we cannot simultaneously determine both the precise velocity and position of a particle. This principle is only applicable at the atomic level.

What is Heisenberg uncertainty principle explain?

uncertainty principle, also called Heisenberg uncertainty principle or indeterminacy principle, statement, articulated (1927) by the German physicist Werner Heisenberg, that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory.

What is the uncertainty in momentum of a particle if uncertainty in position is zero?

Here since you have mentioned that the certainty of position of electron is zero, it would mean that the velocity, or by extension the momentum of the electron is known accurately. This means that the certainty of the momentum would be infinite. Hence the uncertainty of momentum is zero.

Why we Cannot measure position and momentum at the same time?

You cannot measure both position and momentum simultaneously with arbitrary precision for a quantum (very very small) object. The more precisely you pin down its location, the more uncertain its momentum becomes, and vice versa.

Can we measure both the position and momentum of a particle with complete precision?

Can we measure both the position and momentum of a particle with complete precision? No. According to the uncertainty principle, if the uncertainty on the particle’s position is small, the uncertainty on its momentum is large.

Why can’t the speed and position of a particle be known simultaneously?

Essentially, the fact that the speed and position cannot be simultaneously known follows from the fact that “particles” are really waves. Thus, this just boils down to a very simple property of waves and fourier transforms.

Why speed and position cannot be known at the same time?

Thus both cannot be known with absolute certainty at the same time. Hope this helps. This is a very basic property of quantum mechanics which is summarized by the Heisenberg Uncertainty Principle. Essentially, the fact that the speed and position cannot be simultaneously known follows from the fact that “particles” are really waves.

Can a body move with constant speed but not constant velocity?

A body may move at constant speed along a curved path but it does not move with constant velocity, because its direction is changing every instant. The car on the circular track may have a constant speed but not a constant velocity, because its direction of motion is changing every instant.

What happens to the velocity when the speed changes?

If either the speed or the direction (or both) is changing, then the velocity is changing. Constant speed and constant velocity are not the same. A body may move at constant speed along a curved path but it does not move with constant velocity, because its direction is changing every instant.