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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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.
When is the north polar axis tilted most toward the Sun?
What will be an ideal response?
What is the orbital radius of the excited state in the Bohr model of the hydrogen atom? The ground-state radius of the hydrogen atom is 0.529 × 10-10 m
A) 0.477 nm B) 0.159 nm C) 0.382 nm D) 0.549 nm
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.