5.19: cross-sectional area of bacterial cultures

How quickly does bacteria reproduce at?

Every 20 minutes

How can you measure the effectiveness of the antibiotic or antiseptic?

Use the formula πr^{2 -} R is the radius of the zone of inhibition

If one antiseptic had a zone of inhibition with a diameter of 4cm and another had a radius of 3cm, which is more effective?

The second antiseptic is more effective

πx3²=28.27cm²

4/2=2 (the diameter was given, not the radius)

12.57cm²=πx2²

Calculate the zone of inhibition of an antibiotic with a diameter of 10mm

78.54mm²=πx5²