If an object is placed at the center of curvature of concave mirror, the image formed by the mirror is located
A) out beyond the center of curvature.
B) at the center of curvature.
C) between the center of curvature and the focal point.
D) at the focal point.
E) at infinity.
B
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Evidence that supports quasars being the nuclei of very distant galaxies includes
a. the existence of quasar fuzz. b. the observation of a supernova near a quasar whose distance from its brightness is consistent with the large redshift. c. gravitational lensing of some quasars by nearby galaxies. d. all of the above e. none of the above
Dust particles and magnetic fields in the interstellar medium are revealed by ________ of light
Fill in the blank(s) with correct word
A 1.0-C charge is 15 m from a second charge, and the force between them is 1.0 N. What is the magnitude of the second charge?
A) 25 C B) 1.0 C C) 10 nC D) 0.025 C E) 25 nC
The K-ratio in a uranium fuel reactor is defined as the average number of neutrons from each fission event that will cause another event. In a well-functioning reactor, it is desired that the K-ratio have what value?
a. zero b. 0.5 c. 1.0 d. 2.0