aof.sorular.net
Mathematics 1
Mathematics 1 Deneme Sınavı
Mathematics 1 Deneme Sınavı Sorusu #1144666
Mathematics 1 Deneme Sınavı Sorusu #1144666
What is the half-life of a radioactive substance if 90% of the initial amount remains at the end of 25 years ?
50 (ln 0.5) ln 0.9 |
75 (ln 0.9) / ln 0.5 |
25 (ln 0.5) / ln 0.9 |
100 ln (0.5 / 0.9) |
150 ln (0.9 / 0.5) |
Yanıt Açıklaması:
Q(t) = Q0 ek t ; 0.9 Q0 = Q0 ek 25 ; ln 0.9 = k 25 ; k = (ln 0.9) / 25 ; 0.5 Q0 = Q0 e((ln 0.9) / 25) t ; ln 0.5 = ((ln 0.9) / 25) t ; t = 25 (ln 0.5) / ln 0.9 . Correct answer is C.
Yorumlar
- 0 Yorum