# How can a particle be at rest?

In saying “A particle at rest tends to stay at rest,” you could interpret that as saying that a particle that is not moving with respect to some reference objects tends to stay not moving with respect to those same objects.

## Is it possible for a particle to be at rest?

If a particle has no mass (m = 0) and is at rest (p = 0), then the total energy is zero (E = 0). But an object with zero energy and zero mass is nothing at all. Therefore, if an object with no mass is to physically exist, it can never be at rest.

## How do you know when a particle is at rest?

To find when the particle is at rest, we take the velocity (1st derivative formula), set it equal to zero, and solve for t. We find there are two times when this will happen.

## Can a quantum particle be at rest?

There is nothing unacceptable or paradox in it. But exactly knowing the momentum implies that the wave function is infinitely spread. So you know that the particle does not move but the only reason why it can remain at rest is that its position is completely unknown.

## Can Atom be at rest?

In this context, “at rest” means in a reference frame centered at the atom. In practice, you can’t get any system to exactly 0 K, nor can you make an observation from directly on the atom.

## What does particle at rest mean?

Therefore, if s(t) represents the position of a particle along the x-axis at any time t, then the following terms are of importance to our understanding of motion. “initially” means when time t=0. “at the origin” means when the position s(t) = 0. “at rest” means the velocity v(t) = 0.

## How do you describe the motion of a particle?

You can describe the motion of an object by its position, speed, direction, and acceleration. An object is moving if its position relative to a fixed point is changing.

## Can electrons be rest?

A: There aren’t any quantum states of electrons or any other little object that are completely at rest. Every state has a spread of different velocities. The sate of an electron, or even a bigger object like a molecule, will spread out over time.

## Are we 99 empty space?

Every human on planet Earth is made up of millions and millions of atoms which all are 99% empty space. If you were to remove all of the empty space contained in every atom in every person on planet earth and compress us all together, then the overall volume of our particles would be smaller than a sugar cube.

## What happens when electron are rest?

Classically a particle is at rest (in some frame) when its velocity and momentum vanish. In quantum mechanics simply requiring the expectation value of momentum to be zero implies only that the particle’s average velocity is zero.

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## Do electrons flow or vibrate?

When bound in a stable state in an atom, an electron behaves mostly like an oscillating three-dimensional wave, i.e. the orbital vibrates. It’s a bit like a vibrating guitar string.

## Can a proton move?

Protons and neutrons never move from object to object. The energy that comes from these charged particles is called electrical energy.

## Why are electrons always moving?

the electron is constantly interacting with the nucleus via “virtual particles/photons” and the opposite electric charge of the nucleus creates a force that attracts the electron towards the nucleus.”

## What does Z mean in Chem?

Z = atomic number = number of protons in the nucleus = number of electrons orbiting the nucleus; A = mass number = number of protons and neutrons in the most common (or most stable) nucleus.

## Why do atoms vibrate?

Atoms and molecules have energy even at 0 K. This energy causes them to vibrate (among other things). Interactions between various components of the molecules (nuclear/nuclear repulsion, electron/nuclear attraction, electron/electron repulsion, etc.) determine their motion (rotational, vibrational, translational).