The human eye can barely detect a star whose intensity at, Physics

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The human eye can barely detect a star whose intensity at

The human eye can barely detect a star whose intensity at the earth's surface is 1.6 x 10^-11 W/m². If the dark adapted eye has a pupil diameter of 6.2 millimeter, find how many photons per second enter the eye from the star? Assume the starlight has a wavelength of 550 nm.

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