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# Which of the following is the correct definition of 'half-life'?

### Question

Which of the following is the correct definition of 'half-life'?

### Options

A) the average life-time of a radioactive material

B) the time it takes a radioactive material to decay to half of its original quantity

C) half the period a radioactive material decays completely

D) half of the decay constant

E) the decay constant times life-time