Asked by Andy
                How much work must be done to increase the speed of an electron from 0.200c to 0.210c? In (MeV) 
            
            
        Answers
                    Answered by
            Count Iblis
            
    The energy is given by E = gamma m c^2. Take the difference of this for
v= 0.210c and 0.200 c
    
v= 0.210c and 0.200 c
                    Answered by
            drwls
            
    CountIblis is correct.
 
gamma is 1/sqrt[1 - (v/c)^2]
gamma changes from 1.0206 to 1.0461
Multiply the difference by the rest mass energy.
    
gamma is 1/sqrt[1 - (v/c)^2]
gamma changes from 1.0206 to 1.0461
Multiply the difference by the rest mass energy.
                    Answered by
            Andy
            
    is rest mass energy  
9.11e-31 * (3e8)^2 ??
and do I need to convert from J to ev to KeV?
Thanks for the help
    
9.11e-31 * (3e8)^2 ??
and do I need to convert from J to ev to KeV?
Thanks for the help
                    Answered by
            drwls
            
    Yes, that is the rest mass energy in Joules.
Since they do ask for the answer in MeV, use the conversion factor
1 MeV = 1.602*10^-12 J
    
Since they do ask for the answer in MeV, use the conversion factor
1 MeV = 1.602*10^-12 J
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