Answer: Owls have good night vision because their eyes can
Chapter 7, Problem 7.141(choose chapter or problem)
Owls have good night vision because their eyes can detect a light intensity as low as 5.0 3 10213 W/m2 . Calculate the number of photons per second that an owls eye can detect if its pupil has a diameter of 9.0 mm and the light has a wavelength of 500 nm. (1 W 5 1 J/s.)
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