Radioactive mass proportional decay: time for the mass to fall to one third

1. A.
   $k\log 3$
2. B.
   $\dfrac{1}{k}\log 3$
3. C.
   $k\log 5$
4. D.
   $\dfrac{1}{k}\log 5$

Tap an option to check your answer.

1. A.
   $\dfrac{1}{k}\log 3$
2. B.
   $-\dfrac{1}{k}\log 3$
3. C.
   $k\log\left(\dfrac{1}{3}\right)$
4. D.
   $\dfrac{1}{k}\log\left(\dfrac{3}{2}\right)$

Tap an option to check your answer.