When a light ray travels between any two points, the path it takes is the one that (Hint: Eliminate answers you know are wrong.)
A. covers the greatest distance.
B. follows the greatest index of refraction.
C. avoids travel in more than one medium.
D. is the mean between the longest and the shortest paths.
E. takes the least time.
Answer: E
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When Earth was young, its atmosphere had no free ____
a. nitrogen b. oxygen c. helium d. carbon dioxide e. water vapor
A mole of oxygen (O2) molecules and a mole of carbon dioxide (CO2) molecules at the same temperature and pressure have
A) the same average molecular speeds. B) the same number of atoms. C) different average kinetic energy per molecule. D) the same number of molecules. E) different volumes.
What is the source of Jupiter's nonthermal radio radiation?
What will be an ideal response?
How many constitutional isomers that are dibromoethanes exist?
a. 3 b. 4 c. 5 d. 2 e. 6