How is a CCD better than film for astronomical imaging?
A. Film images require developing, CCD images do not.
B. CCDs are much more sensitive to light than film.
C. It is more difficult to enhance the contrast and clarity with film images.
D. All of these choices are correct.
Answer: D
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Which has the greater density?
A) a cup-full of fresh water B) a lake-full of fresh water C) both the same D) need more information
It is said that electric charge is quantized, which means that the charge on an object
A) may occur in an infinite variety of quantities. B) is a whole-number multiple of the charge of one electron. C) will interact with neighboring electric charges. D) can be neither created nor destroyed. E) is sometimes positive.
In a certain material there is a current of 18 A flowing through a surface to the right, and there is an equal amount of positive and negative charge passing through the surface producing the current. How much negative charge passes through the surface?
a. 9 C/s toward the right b. 9 C/s toward the left c. 18 C/s toward the right d. 18 C/s toward the left e. 36 C/s toward the left
When gravitational, magnetic and any forces other than static electric forces are not present, electric field lines in the space surrounding a charge distribution show
a. the directions of the forces that exist in space at all times. b. only the directions in which static charges would accelerate when at points on those lines c. only the directions in which moving charges would accelerate when at points on those lines. d. tangents to the directions in which either static or moving charges would accelerate when passing through points on those lines. e. the paths static or moving charges would take.