Magnification by a lens would be greater if light
A) propagated instantaneously.
B) traveled faster in glass than it does.
C) traveled slower in glass than it does.
D) beams spread less.
E) none of the above
Answer: C
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To measure the mass of an astronomical object, one can observe the orbital period and distance of a companion
Indicate whether the statement is true or false
The number of electric field lines passing through a unit cross-sectional area is indicative of
a. field direction. b. charge density. c. field strength. d. charge motion.
Which of the following would not protect low carbon steel from corrosion in contact with an electrolyte?
(a) Coat the steel completely with copper (b) Attach the steel to the positive terminal of a 12 V battery (c) Attach a piece of zinc to the steel in the area exposed to electrolyte (d) Completely paint the steel
Which of the following gives the two main assumptions of theoretical models of galaxy evolution?
A) Hydrogen and helium filled all of space, and the entire universe had exactly the same density everywhere. B) The universe has always been expanding, and denser areas contracted to form the first stars. C) Hydrogen and helium filled all of space, and certain regions of the universe were slightly denser than others. D) The beginning of the universe is modeled after a supernova explosion, and all elements were produced by this exploding star. E) The universe was composed originally only of hydrogen, and all the other elements came from stars.