XProfan

Windowtitle "Relativistische Masse und Geschwindigkeit beschleunigter Elektronen"
' Demo einer Fortran-90-Übersetzung nach XProfan-11.2a
' (D) 2017-02 by P.Specht, Vienna/Austria; Ohne Gewähr!
' Q: https://jean-pierre.moreau.pagesperso-orange.fr/Fortran/rel_mass_f90.txt
'!********************************************************
'!* Calculate relativistic mass and speed of an electron *
'!* accelerated in an electron gun                       *
'!* ---------------------------------------------------- *
'!* SAMPLE RUN:                                          *
'!*                                                      *
'!* Give electron gun voltage in volts: 1e6              *
'!*                                                      *
'!* Relativistic mass (kg) and speed (m/s):              *
'!*  2.6933944E-30  2.8212490E+08                        *
'!*                                                      *
'!* ---------------------------------------------------- *
'!* Ref.: "Problem Solving with Fortran 90 By David R.   *
'!*        Brooks, Springer-Verlag New York, 1997".      *
'!********************************************************
'!Explanations:
'!------------
'!
'! An electron accelerated by a voltage V in an electron gun
'!
'!                              2     2
'! acquires an energy of Ve = mc - m c,  where
'!                                  0
'!                                        -19
'!  charge on an electron   e = 1.602 x 10    coulomb
'!
'!                                         -31
'!  rest mass               m  = 9.109 x 10    kg
'!                           0
'!                                         8
'!  speed of light          c = 2.9979 x 10  m/s
'!
'! The speed v of an electron of relativistic mass m (kg) is
'! obtained from
'!                                          2
'!                 m/m  = 1 / sqrt(1 - (v/c) )
'!                    0
'!
'!-----------------------------------------------------------
'Program Rel_Mass
'  Implicit None    !All variables must be declared
declare rest_mass!, rela_mass!'! kg
declare voltage!,v$'! volt
declare speed!'! m/s
declare e!'! electron charge in coulomb
declare c!'! speed of light in m/s
rep:
e!=val("1.602e-19")
c!=2.9979e8
rest_mass!=val("9.109e-31")
print "\n  Give electron gun voltage in volts [V]: ";
input v$:case v$>"":voltage!=val(v$)
rela_mass! = (voltage!*e!+rest_mass!*sqr(c!))/sqr(c!)
speed! = c!*sqrt(1.0-sqr(rest_mass!/rela_mass!))
print "\n Relativistic mass [kg] and speed [m/s]:\n"
print " ";format$("%g",rela_mass!);" , ";format$("%g",speed!)
waitinput
cls
goto "rep"
End' of file rel_mass.f90