For radio transmission, which has the higher frequency?
A) carrier wave
B) sound wave
C) neither of these
Answer: A
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A long wire along the x axis is carrying a current increasing at a constant rate in the +x direction. A rectangular coil lies in the x-y plane in the 4th quadrant. In which direction is the induced magnetic field at the center of the rectangular coil?
a. in the –z direction b. There is no direction; the induced current in the coil is zero since the x axis and the coil are in the same plane. c. in the +z direction d. No direction can be found since the orientation of the rectangular coil is not given.
All __________ galaxies are spiral galaxies that have small, luminous nuclei
a. active b. radio c. Seyfert d. double-lobed radio e. blazar
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s
Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much _______ itself
a. infrared radiation b. radio waves c. X-rays d. gamma rays e. all of the above