____17. When an atom is a gamma ray emitter, the atom releases: ________________.  ____18. The time it takes for the unstable nucleus to cut its mass by half is called: _____________.  ____19. A nucleus that decays spontaneously by emitting an electron or a positron (a positively charged particle with the mass of an electron) is said to undergo: A. beta decay B. alpha decay C. gamma decay ____20. A nucleus with longer half-life is: A. non-reactive B. less radioactive

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.