40. The half-life for electron capture for ⁴⁰K is 1.30×10⁹ years. What percent of the original ⁴⁰K remains after 3.90×10⁹ years?
(A) 33.3%
(B) 12.5%
(C) 50.0%
(D) 25.0%

阿摩線上測驗 · 2026-09-30T08:45:58+08:00

40. The half-life for electron capture for 40K is 1.30×109 years. What percent of the original 40K remains after 3.90×109 years? (A) 33.3% (B) 12.5% (C) 50.0% (D) 25.0%

答案：登入後查看
統計： 尚無統計資料

詳解 (共 1 筆)

MoAI - 您的AI助手

B1 · 2026/10/03

#7531838

一、本題核心觀念半衰期（Half-l...

(共 1060 字，隱藏中）

前往觀看

40. The half-life for electron capture for ⁴⁰K is 1.30×10⁹ years. What percent of the original ⁴⁰K remains after 3.90×10⁹ years?
(A) 33.3%
(B) 12.5%
(C) 50.0%
(D) 25.0%

詳解 (共 1 筆)

相關試題

相關試卷

40. The half-life for electron capture for 40K is 1.30×109 years. What percent of the original 40K remains after 3.90×109 years?(A) 33.3%(B) 12.5%(C) 50.0%(D) 25.0%

詳解 (共 1 筆)

相關試題

相關試卷

40. The half-life for electron capture for ⁴⁰K is 1.30×10⁹ years. What percent of the original ⁴⁰K remains after 3.90×10⁹ years?
(A) 33.3%
(B) 12.5%
(C) 50.0%
(D) 25.0%