Find minimum number of photons per second that owl detect


An owl has good night vision because its eyes can detect a light intensity as small as 5.0 10-13 W/m2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 7.5 mm and the light has a wavelength of 515 nm?

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Physics: Find minimum number of photons per second that owl detect
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