The diagram illustrates a system used to regulate the thickness of paper made by a machine. The graph indicates how the detector count rate changes as the paper thickness changes. The rollers compress the paper when the detector count rate falls below 12 counts per second, and they then cease compressing when the count rate goes above 13 counts per second. What is the thickness of the paper as it leaves the machine?
- Abetween 0.40 mm and 0.50 mm
- Bbetween 0.50 mm and 0.60 mm
- Cbetween 0.60 mm and 0.70 mm
- Dbetween 0.70 mm and 0.80 mm