How long does it take the culture to double its mass if a bacterial culture which is growing exponentially increases from 5 g to 7 g in 11 hours?
This is an example of a exponential function.
The form is always
Now we fill in what we know:
Now grow factor
You can do this on your calculator by
The growth factor can then be used in the equation:
From here on there are two ways to go:
(1) put this equation in your GC as Y1= and intersect with Y2=2
(2) Use logarithms:
Answer : a bit more than 22 hours. This is the doubling time from any start situation.