FUNDAMENTALS OF PHYSICS EXTEND 11E
FUNDAMENTALS OF PHYSICS EXTEND 11E
11th Edition
ISBN: 9781119813293
Author: Halliday
Publisher: WILEY
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Chapter 44, Problem 38P

Use Wien’s law (see Problem 37) to answer the following questions: (a) The cosmic background radiation peaks in intensity at a wavelength of 1.1mm. To what temperature does this correspond? (b) About 379 000 y after the big bang, the universe became transparent to electromagnetic radiation. Its temperature then was 2970 K. What was the wavelength at which the background radiation was then most intense?

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Three point-like charges are placed at the corners of a square as shown in the figure, 28.0 cm on each side. Find the minimum amount of work required by an external force to move the charge q1 to infinity. Let q1=-2.10 μC, q2=+2.40 μС, q3=+3.60 μC.
A point charge of -4.00 nC is at the origin, and a second point charge of 6.00 nC is on the x axis at x= 0.820 mm . Find the magnitude and direction of the electric field at each of the following points on the x axis.  x2 = 19.0 cm
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