When is it necessary to use relativistic quantum mechanics?
In Physics, relativistic quantum mechanics is used for explaining the motion of those systems that have a size which is comparable to that of a hydrogen nucleus and are travelling at speeds comparable to the speed of light.
Quantum physics deals with a system that is comparable to a hydrogen nucleus or is smaller than that, in terms of size. Relativistic effects need to be considered if a system travels at speeds comparable to the speed of light.
Thus, it can be concluded that relativistic quantum physics is applicable for very small objects travelling at very high speeds.
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