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# Why are identical particles indistinguishable in quantum mechanics?

## Why are identical particles indistinguishable in quantum mechanics?

In quantum mechanics, identical particles have no individuality. In quantum mechanics, the state of a particle is described by the wave function ψ, which permits determination of just the probability ψ2 of detecting the particle at a given point in space.

### How can we differentiate the identical particle?

There are two methods for distinguishing between particles. The first method relies on differences in the intrinsic physical properties of the particles, such as mass, electric charge, and spin. If differences exist, it is possible to distinguish between the particles by measuring the relevant properties.

What is the difference between identical and indistinguishable?

Indistinguishable in daily life means pretty much the same thing. In case of electrons, we call them identical because they have the same charge and mass and possibly other parameters (spin…) for similar reasons as we call two xerox copies identical.

What is system of identical particles discuss?

The states of a system of identical particles are totally symmetric (antisymmet- ric) under the exchange of any pair if their spin is integer (half-integer). > One can show that systems of identical particles with totally symmetric wave.

## Under what circumstances may identical particles be regarded as distinguishable?

In modeling molecular fluids, two atoms on the same molecule are distinguishable if and only if there is no molecular symmetry interchanging the two atoms, and two atoms in different molecules are distinguishable if and only if there is no congruent matching of the two molecules such that the two atoms correspond to …

### Are all particles identical?

We consider the possibility that all particles in the world are fundamentally identical, i.e., belong to the same species. Different masses, charges, spins, flavors, or colors then merely correspond to different quantum states of the same particle, just as spin-up and spin-down do.

Which state of matter is made up of identical particles?

solid
The individual particles—atoms, ions, or molecules—that made up the solid are the same individual particles that make up the liquid.

What are the identical particles and Pauli’s exclusion principle?

Pauli’s Exclusion Principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers. In other words, (1) no more than two electrons can occupy the same orbital and (2) two electrons in the same orbital must have opposite spins (Figure 46(i) and (ii)).

## What is the difference between distinguishable and indistinguishable particles?

If they are distinguishable (Like a helium-3 atom and a helium-4 atom), then you can switch their positions and the system changes. If they are indistinguishable (Like two protons), switching the two particles’ positions makes no physical change because we do not know whether particles switched at all.

### What do you mean by distinguishable and indistinguishable particle?

Are elementary particles identical?

All elementary particles of a particular type, e.g. all electrons, are excitations of the same quantum field, and are all identical and indistinguishable.

Is matter made up of identical particles?

each element is made up of identical particles of matter called atoms. all the atoms in a pure substance or element are identical to one another but different to the atoms in a different element.