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Chapter 7, Problem 141P

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QUESTION:

Owls have good night vision because their eyes can detect a light intensity as low as \(5.0 \times 10^{−13}~\mathrm {W/m^2}\). Calculate the number of photons per second that an owl's eye can detect if its pupil has a diameter of 9.0 mm and the light has a wavelength of 500 nm. (1 W = 1 J/s.)

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QUESTION:

Owls have good night vision because their eyes can detect a light intensity as low as \(5.0 \times 10^{−13}~\mathrm {W/m^2}\). Calculate the number of photons per second that an owl's eye can detect if its pupil has a diameter of 9.0 mm and the light has a wavelength of 500 nm. (1 W = 1 J/s.)

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