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Modern Physics....

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  Modern physics  is a branch of  physics  that developed in the early 20th century and onward or branches greatly influenced by early 20th century physics. Notable branches of modern physics include  quantum mechanics ,  special relativity  and  general relativity . Classical physics  is typically concerned with everyday conditions: speeds are much lower than the  speed of light , sizes are much greater than that of atoms, and energies are relatively small. Modern physics, however, is concerned with more extreme conditions, such as high velocities that are comparable to the  speed of light  (special relativity), small distances comparable to the  atomic radius  ( quantum mechanics ), and very high energies (relativity). In general, quantum and relativistic effects are believed to exist across all scales, although these effects may be very small at  human scale . While quantum mechanics is compatible with special relativity (See:  Relativistic quantum mechanics ), one of the  unsolved
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Physics(Fundamental science).....

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Physics  is the  natural science  of  matter , involving the study of matter, [a]  its  fundamental constituents , its  motion  and behavior through  space and time , and the related entities of  energy  and  force . [2]  Physics is one of the most fundamental  scientific  disciplines, with its main goal being to understand how the  universe  behaves. [b] [3] [4] [5]  A  scientist  who specializes in the field of physics is called a  physicist . Physics is one of the oldest  academic disciplines  and, through its inclusion of  astronomy , perhaps  the  oldest. [6]  Over much of the past two millennia, physics,  chemistry ,  biology , and certain branches of  mathematics  were a part of  natural philosophy , but during the  Scientific Revolution  in the 17th century these natural sciences emerged as unique research endeavors in their own right. [c]  Physics intersects with many  interdisciplinary  areas of research, such as  biophysics  and  quantum chemistry , and the boundaries of phy
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