A 15.8-mW laser puts out a narrow beam 2.0 mm in diameter.Suppose that the beam is in free space. What is the rms value of E in the beam? What isthe rms value of B in the beam?Prob. 28, page 834. Ans: Erms= 1380 V/m, Brms =4.59×10-6 T

A 15.8-mW laser puts out a narrow beam 2.0 mm in diameter.Suppose that the beam is in free space. What is the rms value of E in the beam? What isthe rms value of B in the beam?Prob. 28, page 834. Ans: Erms= 1380 V/m, Brms =4.59×10-6 T

Physics for Scientists and Engineers, Technology Update (No access codes included)

9th Edition

ISBN:9781305116399

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter34: Electromagnetic Waves

Section: Chapter Questions

Problem 34.7P: Suppose you are located 180 in from a radio transmitter. (a) How many wavelengths are you from the...

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Question

A 15.8-mW laser puts out a narrow beam 2.0 mm in diameter.
Suppose that the beam is in free space. What is the rms value of E in the beam? What is
the rms value of B in the beam?
Prob. 28, page 834. Ans: Erms= 1380 V/m, Brms =4.59×10-6 T

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