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Suppose you observe the star using a telescope with an aperture diameter of 20 cm and which delivers 90% of the incident light to the B-band filter, and you use a CCD having a full well capacity of 151,000 electrons and a quantum efficiency of 80% at and close to a wavelength of 0

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Suppose you observe the star using a telescope with an aperture diameter of 20 cm and which delivers 90% of the incident light to the B-band filter, and you use a CCD having a full well capacity of 151,000 electrons and a quantum efficiency of 80% at and close to a wavelength of 0.44 μm. Assuming that all the light from the star falls onto one pixel: a) what is the count in ADU's if you integrate for 1 s and the gain of the CCD is set to 2.3 e- /ADU?

 b) how long can you integrate before you saturate the CCD at that pixel? 

 c) if instead the light from the star is evenly spread over 9 pixels, how would the answer to part b) change?