Multiple Choice
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
Correct Answer:
Verified
Correct Answer:
Verified
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