<span>The relation between number of half-lives and the amount of sample that remained is expressed as:
(1/2)^n = x
So, given is 7.
To find x, we will change the equation with 7:
(1/2)^n = x
(1/2)^7 = x
0.5^7 = x
0.0078125 = x
0.0078125 x 100% = x
x = 0.78125
Therefore, 0.78 % of a radioactive species would be created as daughter material after seven half-lives.</span>
Answer:
D. B. C. A.
Yours goals for the future are immediately directed by your quality of life although dictated by your lifespan.
When children are small they are given vaccines that are usually dead viruses given to the body. These viruses don't cause damage to body and the body takes it as a real virus and prepare antibodies in the body but when a certain real disease or virus is in the body , the already presented antibodies fight with them for the protection of the body. These antibodies remain in the body so that when a disease or virus attacks the body the antibodies are already geared up to fight against them. Thus antibodies protect the body against invading microbes or viruses.
Thank you! same for u my friend! have an amazing life! :)
