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The minimum number of photons per second?

by girlygirl55
Tags: minimum, number, photons
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May22-10, 12:50 PM
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1. The problem statement, all variables and given/known data

An owl has good night vision because its eyes can detect a light intensity as small as 4.5 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 503 nm?

2. Relevant equations

I'm not really sure how to begin. Can you help me solve this step by step?

Photons per sec= Energy per sec/Energy per photon ??

3. The attempt at a solution
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May22-10, 02:11 PM
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P: 2,155
Quote Quote by girlygirl55 View Post
Photons per sec= Energy per sec/Energy per photon
Sure, that'd be a good start.

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