In order to produce an image double the size of an object with a converging lens of focal length f, what object distance should be used?
A. f
B. f/2
C. 2f
D. 2f/3
E. 3f/2
E. 3f/2
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Energy
a)is the same thing as power. b)is a vector quantity. c)is measured in the same units as work. d)has the same units of velocity. ?
A radar pulse is bounced off the Moon at a distance of 400,000 km. What is the time from the transmitting of the pulse until its return?
a. 1.28 s c. 2.67 s b. 2.56 s d. 3.84 s
For a displacement standing wave in an air column in a pipe that is open at both ends, there must be at least:
a. one node and one antinode. c. two antinodes and one node. b. two nodes and one antinode. d. two nodes and two antinodes.
The region of the electromagnetic spectrum with frequencies just greater than those in the ultraviolet region is the ______________ region
a. x-rays b. radio waves c. microwaves d. infrared e. gamma rays