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## Homework Statement

Observing a star with a telescope where a photomultiplier is applied, 5 photons per second are detected on the average.

Assuming a Poissonian statistics and the the background is negligible, determine the integration time useful to measure the flux with a standard deviation of 5% of the average flux, and the determine the magnitude error.

## Homework Equations

Poissonian statistic: [itex]P(n)=e^{-\lambda}{\lambda^n}/{n!}[/itex]

## The Attempt at a Solution

I can not outline the problem... Any suggestion please?