Visit http://ilectureonline.com for more math and science lectures!

To donate:
http://www.ilectureonline.com/donate
https://www.patreon.com/user?u=3236071

A freshly prepared sample of a radioisotope of half-life 1386 seconds has activity 10^3 disintegrations per second. Given that ln2=0.639, the fraction of the initial number of nuclei (expressed in nearest integer percentage) that will decay in the first 80 seconds is? (integer 1-9)

Previous video in this series can be seen at:
https://youtu.be/fKcJpVQ05Y4
Next video in this series can be seen at:
https://youtu.be/o_fw4k2pMiE