半減期化学問題 - 原子核放射性崩壊計算の練習例
How to Calculate Decay constant given half life of a radioactive element
GCSE Physics - Radioactive Decay and Half Life
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GED Science – Atoms and Elements!
核半減期：計算
Half Life Chemistry Problems - Nuclear Radioactive Decay Calculations Practice Examples
Radioactive Decay Calculations Practice Problem
48: Radioactive decay calculation
Find Age of Substance From Given Half Life Exponential Decay
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Half Life Equation Derivation
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How To Calculate Half Life
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半減期の計算
