A radioactive sample with a half life of 1 month has the label: Activity = 2 micro curies on 1-8-1991. What would be its activity two months earlier?
(a) 1. 0 micro curie
(b) 0.5 micro curie
(c) 4 micro curie
(d) 8 micro curie
A radioactive sample with a half life of 1 month has the label: Activity = 2 micro curies on 1-8-1991. What would be its activity two months earlier?
(a) 1. 0 micro curie
(b) 0.5 micro curie
(c) 4 micro curie
(d) 8 micro curie