Light waves travel fastest in
a. water.
b. glass.
c. a vacuum.
d. air.
e. none of these; they travel at the same speed in all these media.
c
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A) 0.477 nm B) 0.159 nm C) 0.382 nm D) 0.549 nm
the electric force on the proton 
A. The vector points in the +x direction. B. The vector points in the -x direction. C. The vector points in the +y direction. D. The vector points in the -y direction. E. The vector points in the +z direction. F. The vector points in the -z direction. T. The vector is zero.
One end of a rope is pulled with 100 N, while the opposite end also is pulled with 100 N. The tension in the rope is
A) 0 N. B) 50 N. C) 100 N. D) 200 N.