After a special medicine is introduced into a petri dish full of bacteria, the number of bacteria remaining in the dish decrease
s rapidly. The relationship between the elapsed time t, in seconds, and the number of bacteria, N(t), in the petri dish is modeled by the following function:
N(t)=1000⋅(12)^t/5.5
Complete the following sentence about the half-life of the bacteria culture.
The number of bacteria is halved every ___ seconds.