From: tjroberts137@sbcglobal.net   
      
   On 6/28/21 8:28 AM, Nicolaas Vroom wrote:   
   > I have to measure the speed of light and I have to measure the speed   
   > of an electron v_e or of a cosmic ray.[...]   
      
   Before worrying about that, you should first study significant digits,   
   experimental resolutions, and errorbars. That will give you perspective   
   about your questions. Your example numbers are unrealistic and   
   unworkable, which that study would teach you to avoid.   
      
   > A more advanced question is what to do in case the speed of cosmic   
   > ray is higher than the speed of light i.e 299792458,0995 m/sec versus   
   > 299792458 m/sec in vacuum.   
      
   That study will also teach you how to handle this -- such a measurement   
   is OK and not unexpected, as long as your measurement resolution is   
   about 0.04 m/sec or larger.   
      
   Tom Roberts   
      
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