Yeast cells are suspended in a liquid medium. A 2 mL sample of the suspension is withdrawn. A total of 56 yeast cells are counted.
a. Estimate the concentration of yeast cells per mL of suspension, and find the uncertainty.
b. What volume of suspension must be withdrawn to reduce the uncertainty to 1 cell per mL?
You might also like to view...
Derating factors shall only be applied when the number of current-carrying conductors in a wireway exceeds _____.
a. 15 b. 20 c. 25 d. 30
Si la carga continua de un circuito derivado se mide en 20A, ¿qué amperaje debería tener la protección contra sobrecorriente?
a. 15A b. 20A c. 25A d. 30A
What must the technician do before checking an air conditioning system for refrigerant leaks using a black light?
A) Turn the system off and allow the pressure to equalize B) Evacuate the system C) Install dye in the system D) Overcharge the system by 10 oz.
If a digital meter face shows 0.93 when set to k ohms, the reading means ________
A) 9300 ohms B) 93 ohms C) 930 ohms D) 93000 ohms