Question

In context of quantum mechanics explain:
 a)Decay time
 b)Time of life
 c) Average life
 d) Half-life

Answer 1

Decay Time: The time taken by a quantity to decay to a stated fraction of its initial value ;the fraction is commonly 1/e is known as decay time.

Time of life: A period of time during which a particle is normally in a particular state is know as time of life.

Average life: In radioactivity, average lifetime of all the nuclei of a particular unstable nuclei is thought of as the sum of the lifetimes of all the individual unstable nuclei in a sample divided by the total number of unstable nuclei present. The average lifetime of a particular species of a unstable nuclei is always 1.443 times half life.

Half life: Half life is the time required for a quantity to reduce to half of its initial value. The term is naturally used in nuclear physics to describe how long an nuclei survive. A stable nuclei has larger half life compared to unstable nuclei.