Question

After incubation of two bacteria cultures for 132, minutes, the number of bacteria present is 20,000. What is the generation time?

• A. 2 minutes
• B. 5 minutes
• C. 10 minutes
• D. 30 minutes

Answer 1

The correct option is C 10 minutes

Using the following formula:

N${}_t$ = N${}_o$ X 2 ${}^n$ ,

where, N${}_t$ is number after time t

N${}_o$ is initial number

2 ${}^n$ is generation time,

we get

20,000= 2 X 2 ${}^n$

10,000 = 2 ${}^n$

equating the bases as same,

2${}^{13.2}$ = 2 ${}^n$, given, n= 132 minutes,

132/13.2 = 10

Hence, the correct answer is '10 minutes'