Homework Help: physics-repost

Posted by Stephy on Saturday, April 26, 2008 at 5:51pm.

An owl has good night vision because its eyes can detect a light intensity as small as 5.0*10^-13W/M^2. What is the minimum number of photons per second that an owl eye can detect if its pupil has a diameter of 8.5nn and the light has a wavelength of 510nm?

Can anyone please give me some ideas to do it? THANKS A LOT!

physics-repost - bobpursley, Saturday, April 26, 2008 at 6:14pm
The energy into the owl eye is given, multiply that by the area of the eye.

Now the will be the energy per second.

To find the number of photons, planck's equation

Energy above*numberPhotos=hc/lambda

solve for the number of photons.

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