When a light beam emerges from water into air, light speed
A) increases.
B) decreases.
C) remains the same.
Answer: A
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Plane Mirrors: You may have seen ambulances on the street with the letters of the word AMBULANCE written on the front of them, in such a way as to appear correctly when viewed in your car's rear-view mirror. (See the figure.) How do the letters appear when you look directly at the ambulance (not through the mirror)?
A. a B. b C. c D. d E. e
What are the dimensions of the diffusion constant?
A. 
B. 
C. 
D. 
E. 
Compared to the entire electromagnetic spectrum, visible light is ________.
A. the least energetic B. the most energetic C. a small fraction of the possible wavelengths of light D. the most valuable to astronomers E. the fastest moving
When a ball is thrown straight up, which of the following is zero at its highest point?
A) acceleration B) displacement C) velocity