Acertain radioactive isotope placed near a geiger counter registers 160 counts per second. 32 hours later, the counter registers 10 counts per second. what is the half-life of the isotope?

a. 8 hours

b. 16 hours

c. 24 hours

d. 32 hours

e. none of the above

I believe that the answer for this question would be option A. 8 HOURS. Based on the given scenario above about a certain radioactive isotope placed near a Geiger counter, the half-life of the isotope 32 hours later would be 8 hours. Hope this is the answer that you are looking for.