A Certain Radioactive Isotope Placed near a Geiger Counter Registers

question 109

Multiple Choice

A certain radioactive isotope placed near a Geiger counter registers 160 counts per second. Eight hours later, the counter registers 10 counts per second. What is the half life of the isotope?

• A) 4 hours
• B) 6 hours
• C) 8 hours
• D) 2 hours
• E) none of these

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