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Because there are no definite positions. There are only probability distributions.

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Q: Why the concept of trajectory is meaningless in quantum mechanics?
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Why is concept of trajectory meaningless in quantum mechanics?

Because there are no definite positions. There are only probability distributions.


When was Principles of Quantum Mechanics created?

Principles of Quantum Mechanics was created in 1930.


Why it is said relativistic quantum mechanics?

The distinction is sometimes made to distinguish normal quantum mechanics (which does not incorporate special relativity) and quantum field theory (relativistic quantum mechanics). Since we know special relativity is correct it is the relativistic form of quantum mechanics which is true, but non-relativistic quantum mechanics is still used, because it is a good approximation at low energies and it is much simpler. Physics students typically study regular quantum mechanics before moving on to quantum field theory.


Why Heisenberg principle introduce?

The German scientist Werner Heisenberg developed his uncertainty principle, a major concept in quantum mechanics, in 1927.


Is newton known for quantum mechanics?

The concepts of quantum mechanics were not explored until the 20th century. Newton only lived into the 18th century, so Newton did no work on quantum mechanics.


What is a mixed state in quantum mechanics?

The mixed state in quantum mechanics is the statistical ensemble of the pure states.


Who created Quantum Mechanics and is it true that it is replacing the old physics?

Quantum Mechanics "replaced" Classical Mechanics in particle physics in mid-1930s.


Why quantum mechanics is someone called wave mechanics?

It is also called wave mechanics because quantum mechanics governed by Schrodinger's wave equation in it's wave-formulation.


Why quantum mechanics exist?

Basically, quantum mechanics provides the answer for some questions which are previously unanswered like why the energies of each emited electron increases (but the number of electrons not increased) when the frequency of light waves striking the metal surface increased in photoelectric effect? This can only be explained when we regard light waves as particles (photons). So, it is the birth of particle-wave duality concept and quantum mechanics.


What is the alternative to quantum mechanics?

Classical Mechanics and Wave Theory.


Is quantum mechanics a set of fields or is it just a lone branch of mechanics?

Quantum mechanics is a separate branch of physics. It is a general term given to all quantum physics. There are many subbranches, for example Quantum chronodynamics which describes the strong nuclear interaction.


Why plasma is not explained with quantum mechanics?

I am not aware of it "not being explained". I would guess that you can explain the relevant aspects with quantum mechanics.