Question 1163965

Find the decay rate of Arsenic-74 when the half- life is 17.5 days.  Round to six decimal places.
<pre>If ½ (.5) life is “a” time intervals, then {{{highlight_green(matrix(1,17, DECAY, "CONSTANT/RATE,", or, k, "=", ln(.5)/a, "=", ln(.5)/17.5, "=",  
-0.03960841, "=", - .039608, "(rounded", to, 6, decimal, "places)"))}}}
The DECAY CONSTANT/RATE, or "k" being < 0 indicates DECAY RATE, since the substance will DECAY and cause its MASS to DECREASE, over time!