An 8.000-mW laser beam emits a cylindrical beam of light 0.9000 mm in diameter. What is the rms value of the electric field in this beam?
A) 2176 N/C
B) 1000 N/C
C) 1088 N/C
D) 4122 N/C
E) 2000 N/C
A
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The glass in a window is 35 inches wide and 20 inches tall, and standard atmospheric pressure is 14.7 pounds per square inch. What net force would result on the glass if the air pressure outside the house were 1% lower than the air pressure inside?
A. 10300 pounds outward B. 103 pounds inward C. There would be no net force D. 103 pounds outward E. 10300 pounds inward
Wien's Law: The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What is the peak wavelength of this radiation? The constant in Wien's law is 0.0029 m ? K.
What will be an ideal response?
Distinguish an Sa from an Sc galaxy
What will be an ideal response?
Two cylindrical resistors are made of the same material and have the same resistance. The resistors, R1 and R2, have different radii, r1 and r2, and different lengths, L1 and L2 . Which of the following relative values for radii and lengths would result in equal resistances?
a. r1 = r2 and L1 = 2L2 b. 2r1 = r2 and L1 = 2L2 c. r1 = r2 and 4L1 = L2 d. 2r1 = r2 and 4L1 = L2