A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?
A)8 hours
B)6 hours
C)4 hours
D)2 hours
E)none of the above

Question

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The Answer of A certain radioactive isotope placed near a Geiger counter registers 160 counts per minute. Eight hours later, the counter registers 10 counts per minute. What is the half-life of the isotope?
A)8 hours
B)6 hours
C)4 hours
D)2 hours
E)none of the above

A Certain Radioactive Isotope Placed near a Geiger Counter Registers