Help pls ! Lead-196 has a half-life of 37 minutes. It decays into thallium-196. Suppose a sample contains 20 atoms of lead-196 and 60 atoms of thallium-196. About
how old is the sample?

c. rb

explanation:

the atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.

current flows in a wire

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.