The Half- Life of Radium Is

Multiple Choice

The half- life of radium is

A) half of the total time during which a quantity of radium will radioactively decay.
B) the time during which half of a large number of radium atoms will decay.
C) half the lifetime of the individual radium atom.
D) the life- time of the individual radium atom.
E) the time after which an individual radium atom splits in half.