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GATE2017-39

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For an $\textit{E.coli}$ culture in the exponential phase of growth, optical density (OD) at $540$ nm is $0.3$ at $2$ hours and $0.6$ at $4$ hours. Assuming that the measured OD is linearly proportional to the number of $\textit{E.coli}$ cells, the growth rate (per hour) for this culture is _________.
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