I = 1 (.96)^m
.20 = .96^m
using logs
m = log .2/log .96 = appr 39.4
it would take about 39.4 m
The intensity of light decreases by 4% for each meter that it descends below the surface of the water. At what depth is the intensity of light only 20% of that at the surface?
3 answers
A colony of bees doubles in population every 5 weeks. how long does it tak for the population to triple?
Log(3/1)/Log(2)=1.58
1.58x5=7.9 weeks
1.58x5=7.9 weeks