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There are two telescopes observing at night. The first telescope is 0.3m and has a focal ratio of f/8. The second telescope has a focal ratio of f/4 and is 30m in diameter. They each have an identical CCD camera whose pixels are 25 microns on a side. How much energy will be accumulated in a single pixel in a 100s exposure?

Note: Object being observed has an apparent brightness of 1.0*10^-7 W m^-2 and has an angular diameter of 15 arcsec.

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