On Dec 3 at 1pm, a radioactive substance had 9.8e5 disintegrations/min.
On Dec 17 at 2:15pm, it had reduced to 2.6e4 disintegrations/min.
What is the half-life of the substance?
On Dec 3 at 1pm, a radioactive substance had 9.8e5 disintegrations/min.
On Dec 17 at 2:15pm, it had reduced to 2.6e4 disintegrations/min.
What is the half-life of the substance?