Classical Physics Does Not Adequately Describe the Interaction of Light with Matter

Classical Physics Does Not Adequately Describe the Interaction of Light with Matter 

The motion of objects in the everyday world can be well described by the laws of classical physics—a description of the physical world that began with the development of the laws of motion by Isaac Newton. These laws were enormously successful as a unifying principle in physics until the end of the nineteenth century. 

The principal assumptions of classical physics can be sununarized as follows  

The physical state of any system can be described by a set of quantities called dynamical variables that take on well-defined values at any instant of time. 

The future state of any system is completely determined if the initial state of the 

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