The minimum number of photons per second?

by girlygirl55
Tags: minimum, number, photons
girlygirl55 is offline
May22-10, 12:50 PM
P: 1
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
Phys.Org News Partner Science news on
Lemurs match scent of a friend to sound of her voice
Repeated self-healing now possible in composite materials
'Heartbleed' fix may slow Web performance
diazona is offline
May22-10, 02:11 PM
HW Helper
P: 2,156
Quote Quote by girlygirl55 View Post
Photons per sec= Energy per sec/Energy per photon
Sure, that'd be a good start.

Register to reply

Related Discussions
minimum number of relays per h-bridge Electrical Engineering 6
minimum argument of a complex number Calculus & Beyond Homework 2
Minimum number of common elements in sets Set Theory, Logic, Probability, Statistics 2
Minimum photons-per-second required for 150 KHz? General Physics 0
minimum number of weights Calculus & Beyond Homework 0