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Science Bowl Question

📅 NSB 2012🎓 HS🔄 Round 6#️⃣ Q21🌟 BONUS📝 Multiple Choice

A radioactive element has a half life of 50 seconds. Which of the following is true of a sample of such an element?

W) Every atom of the element decays after 50 seconds
X) Every atom of the element decays after 100 seconds
Y) After 100 seconds, one fourth of the sample has decayed
Z) After 100 seconds, three fourths of the sample has decayed
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