Physics for Scientists and Engineers
Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 31, Problem 69P

(a)

To determine

The total energy of the pulse.

(b)

To determine

The number of photons emitted.

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A helium–neon laser emits laser light at a wavelength of 632.8 nm and a power of 2.3 mW. At what rate are photons emitted by this device?
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 helium‑neon laser produces light of wavelength 632.8 nm. The laser beam carries a power of 0.75 mW and strikes a target perpendicular to the beam. How many photons per second, n, strike the target? n = ? photons/s At what rate R does the laser beam deliver linear momentum to the target if the photons are all absorbed by the target? R = ? kg·m/s2

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