Physics Unit30: Nuclear Physics and Radioactivity (id: f0e867fbb)

[单选题]
How long would it tavxtz k :4h,qy9k)8 repnls+ s99wq bz9ke $4.0 \times 10^{20} \; atoms$ to decay to $1.0 \times 10^{19} \; atoms$ if their half-life was 14.7 years?

A. $29.4 \; years$
B. $58.8 \; years$
C. $78.2 \; years$
D. $147 \; years$


参考答案:  C


本题详细解析: 暂无