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 38.26P

(a)

To determine

The number of visible light photons emitted per second.

(b)

To determine

The distance at which there will be 1.00×1011photons/seccm2 .

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(a) If the average frequency emitted by a 120 W light bulb is 5.00 * 10^14 Hz and 10.0% of the input power is emitted as visible light, approximately how many visible-light photons are emitted per second? (b) At what distance would this correspond to 1.00 * 10^11 visible-light photons per cm2 per second if the light is emitted uniformly in all directions?
A flashlight emits 1.0W of light energy. Assuming a frequency of 5.2 x 10^14 Hz for the light, determine the number of photons given off by the flashlight per second.
Monochromatic light of frequency 6.0 ×1014 Hz is produced by a laser. The power emitted is 2.0 ×10-3 W. (a) What is the energy of a photon in the light beam? (b) How many photons per second, on an average, are emitted by the source?

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University Physics with Modern Physics (14th Edition)

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