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A Certain Radioactive Isotope Placed near a Geiger Counter Registers

Question 25

Multiple Choice

A certain radioactive isotope placed near a Geiger counter registers 120 counts per minute.If the half-life of the isotope is one day,what will the count rate be at the end of four days?


A) 30 counts/min
B) 15 counts/min
C) 10 counts/min
D) 7) 5 counts/min
E) 5 counts/min

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