University Physics with Modern Physics (14th Edition)
University Physics with Modern Physics (14th Edition)
14th Edition
ISBN: 9780321973610
Author: Hugh D. Young, Roger A. Freedman
Publisher: PEARSON
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Chapter 38, Problem 38.2E

(a)

To determine

The frequency of the photon.

(b)

To determine

The energy delivered to the receptor cell in joules and electron volts.

(c)

To determine

The speed of a bacterium having the energy found in part (b).

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The human eye can barely detect a star whose intensity at the earth’s surface is 1.6 x 10-11 W/m2. 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 wavelength of 550 nm.
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University Physics with Modern Physics (14th Edition)

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