Solved Problem

1. Half llife of a radio-active substance is 1600 hours. Find its mean life and decay constants. After how

many hours will 75% of the substance decay radioactively?

Solution

T = Half life = 1600 Hrs.
t = mean life = ?
l = Decay constant =?
t = ?

**********

[next page]

Index

34.1 Laws of radio - active transmutation
34.2 Law of radio - active decay
34.3 Half - Life period : T
34.4 Mean Life Time : t

Chapter 35