Physics question:Whats the formula for calculatingHalf-life?

• qwerys

  18 Jul 07, 16:42

  i lost my physics notes desperately need to know the formula
  
  help appreciated
• the_unknown

  18 Jul 07, 16:46

  i tink this shld help u halflife
• CoolMyth

  18 Jul 07, 16:51

  Half Life proportional to the inverse of the number of atoms left in the sample.
  
  Something like that?