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  5. 9.14 Mass-energy equivalence in practice

9.14 Mass-energy equivalence in practice

 

Unfortunately, many treatments of the issue of mass-energy equivalence in textbooks and on the internet can be confusing due to the use (abuse?) of the relationship \( {E} \)  =  \( {mc^2 } \) which was discussed previously in Section 9.9 (recall ). 

The equivalence of mass and energy can be better expressed as

rest energy = \( {E_0} \)  =  \( {mc^2 } \)

or

change of energy = \( {\Delta E} \)  =  \( {(\Delta m)c^2} \), where \( {(\Delta m)} \) is the corresponding change in mass.

 

 

 

 

 

 

Practical examples of mass-energy conversion (binding energies, radioactivity, nuclear reactions, nuclear fission and fusion, etc.) will be treated in Chapter 27 of Understanding Physics.

 

For a good general philosophical discussion on the whole issue see the entry on  in the .

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Understanding Physics

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