Beginning through the Pedrotti optics book -- I have an energy question

AI Thread Summary
Relativistic mass is infrequently used in modern physics discussions, with a preference for concepts like rest mass and energy instead. The equation P = sqrt(E^2 - (mc^2)^2/c) represents the relativistic energy-momentum relationship, which connects energy, momentum, and mass in relativistic contexts. Understanding this equation is crucial for grasping how energy and momentum behave at high velocities. It is important to note that this equation does not express kinetic energy, which is defined differently. Clarifying these concepts is essential for a deeper understanding of the material in the Pedrotti optics book.
universal2013
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Hello. I started to work on pedrotti optics book (2nd edition) and i got confused about what is relativistic mass and why we use it rather than kinetic energy (1/2mc^2)?
Also in the beginning of these explanations there is one equation i barely understand nothing out of it. Could you please explain this equation and where does it comes from please?
P=sqr(E^2-(mc^2)^2/c . Thank you!
 
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universal2013 said:
Hello. I started to work on pedrotti optics book (2nd edition) and i got confused about what is relativistic mass and why we use it rather than kinetic energy (1/2mc^2)?
As far as relativistic mass goes, it's rarely used these days. And that's not an expression for kinetic energy.
universal2013 said:
Also in the beginning of these explanations there is one equation i barely understand nothing out of it. Could you please explain this equation and where does it comes from please?
P=sqr(E^2-(mc^2)^2/c .
That equation is the relativistic energy-momentum relationship. Start here: Energy–momentum relation
 
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