Physics Unit30: Nuclear Physics and Radioactivity (id: f1ef71e79)

[单选题]
How long will it take + q.1xsr jsb*aes b1u7ac3w**6 tfchw i1 cxg4w $4.5 \; Ci$ sample of material to reach an activity level of $0.14 \; Ci$ if the half-life is 435 years?

A. $14,478 \; years$
B. $3245 \; years$
C. $2178 \; years$
D. $1993 \; years$


参考答案:  C


本题详细解析: 暂无