Which of the following statements about radioactivity is not true?
A) The number of radioactive particles in a sample is directly proportional to the activity of that sample.
B) If the half-life of a sample is 10 years, then after 20 years only 25% of the sample will remain.
C) Over time, the radioactivity of a sample will increase.
D) Alpha, beta, and gamma are the three main types of radioactive decay.
E) All of the above are true.
Correct Answer:
Verified
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