| The human eye can barely detect a star whose intensity at he earth's surface is 1.6 X 10-1 W/m?. If the dark-adapted eye nas a pupil diameter of 7.0 mm, how many photons per second enter the eye from the star? Assume the starlight has a wave- ength of 550 nm.
| The human eye can barely detect a star whose intensity at he earth's surface is 1.6 X 10-1 W/m?. If the dark-adapted eye nas a pupil diameter of 7.0 mm, how many photons per second enter the eye from the star? Assume the starlight has a wave- ength of 550 nm.
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Ch 25 / P 49
Transcribed Image Text:49. II| The human eye can barely detect a star whose intensity at
BIO the earth's surface is 1.6 X 10-11 W/m?. If the dark-adapted eye
has a pupil diameter of 7.0 mm, how many photons per second
enter the eye from the star? Assume the starlight has a wave-
length of 550 nm.
11
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