The count rate of a radioactive sample decreases from 1600 counts per minute to 100 counts per minute in 8 hours. What is its half-life?
Q1. The count rate of a radioactive sample decreases from 1600 counts per minute to 100 counts per minute in 8 hours. What is its half-life?
Answer: 2 hours
Explanation: Using the formula for count rate and half-life, we can determine that the half-life is 2 hours. Option 'C' misinterprets the count rate directly as half-life.