no
The mixed state in quantum mechanics is the statistical ensemble of the pure states.
Classical Mechanics and Wave Theory.
There is no reasonable alternative to quantum mechanics, at least not something that can even compare with the predictive power and experimental accuracy as quantum theory. If you want to make predictions about things happening at small scales you cannot do without quantum mechanics. Also note that certain models which are now considered as possible theories of everything (e.g. string theory) all expand upon quantum mechanics, they do not make quantum mechanics invalid or unnecessary.
This is the title of a book that teaches how to perform the calculations of Quantum Mechanics, in very simple easy to follow terms.
Because light waves and radioactive decay are some of the key factors that lead to the development of Quantum Mechanics. Quantum mechanics is also our best apparatus for describing and predicting those phenomena.
Yes, as well as other things. Quantum mechanics (also called wave mechanics) is the only approach that can accurately predict the probability of where and in what state matter will end up, given certain initial conditions.
Principles of Quantum Mechanics was created in 1930.
I believe experts in quantum mechanics (or other advanced physics topics) can find work in research, and in teaching. For more details, in the case of the United States you may want to consult the OOH (Occupational Outlook Handbook).
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.
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.
The mixed state in quantum mechanics is the statistical ensemble of the pure states.
Quantum Mechanics "replaced" Classical Mechanics in particle physics in mid-1930s.
It is also called wave mechanics because quantum mechanics governed by Schrodinger's wave equation in it's wave-formulation.
Classical Mechanics and Wave Theory.
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.
The Many Worlds Theory is a hypothesis in quantum mechanics that suggests there are multiple parallel universes that exist simultaneously. According to this theory, every possible outcome of a quantum event is realized in a separate universe. While this theory is not proven, it is a way to interpret certain aspects of quantum mechanics and is a topic of ongoing research and debate among physicists.
There is no reasonable alternative to quantum mechanics, at least not something that can even compare with the predictive power and experimental accuracy as quantum theory. If you want to make predictions about things happening at small scales you cannot do without quantum mechanics. Also note that certain models which are now considered as possible theories of everything (e.g. string theory) all expand upon quantum mechanics, they do not make quantum mechanics invalid or unnecessary.