General Physics, 2nd Edition
General Physics, 2nd Edition
2nd Edition
ISBN: 9780471522782
Author: Morton M. Sternheim
Publisher: WILEY
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Chapter 26, Problem 8E
To determine

The number of photons per square meter is incident on the earth per second.

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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?
(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?
15.(a)What is the frequency of an x-ray photon whose momentum is 1.1x 1023 kg m/s? (b) How much energy must a photon have if it is to have the momentum of a 10-MeV proton?
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