A radioactive substance decays such that its mass halves every 3 days. If you start with 128 grams, how many grams will remain after 15 days?

Sat, 02 May 2026 16:38:49 +0000

**Why A Radioactive Substance Decays Every 3 Days? The Science Behind the Half-Life Mystery** In a world obsessed with longevity, data, and the invisible forces shaping our daily lives, a growing number of people are asking: Why does a radioactive substance lose half its mass every three days? If you begin with 128 grams, the answer isn’t just mathematical—it’s a gateway to understanding how atoms behave, and why understanding decay patterns matters in science, medicine, and technology. This basic decay model, where mass halves every 3 days, reflects the predictable rhythm of radioactive decay, a process central to fields from nuclear medicine to carbon dating. Understanding how much remains after 15 days isn’t just an academic puzzle—it’s a question many encounter while learning about science, health, or environmental monitoring. As interest peaks in precision, safety, and transparency, this decay curve offers clear insights into time, risk, and control. **Why Is This Decay Pattern Gaining Attention in the US?**
Radioactive decay isn’t new, but public curiosity is growing—fuelled by podcasts, health tech, and environmental news. From radiation safety training to cancer treatments using isotopes, the concept touches real-world applications that demand clarity. The predictable 3-day halving of 128 grams into 5 grams after 15 days demonstrates nature’s measurable precision. This resonates with an audience seeking trustworthy, data-driven answers in an era where misinformation spreads quickly.