Which of the following devices use lasers?
a. DVD players
b. fiber optics communication systems
c. photocopiers
d. UPC price scanners
A, B, D
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An ore car of mass 4 000 kg starts from rest and rolls downhill on tracks from a mine. A spring with k = 400 000 N/m is located at the end of the tracks. At the spring's maximum compression, the car is at an elevation 10 m lower than its elevation at the starting point. How much is the spring compressed in stopping the ore car? Ignore friction
If you shuffle a deck of cards, how likely is it that you will get all of the cards in the sequence shown in the figure relative to any other sequence?
a. The sequence shown in the figure is exceedingly less likely than any other sequence. b. Any given sequence, including the one shown in the figure, is equally rare and equally likely. c. It is impossible to tell without a computer calculation.
If light from a 560 nm monochromatic source in air is incident upon the surface of fused quartz (n = 1.56) at an angle of 70°, what is the wavelength of the ray refracted within the quartz?
a. 560 nm c. 192 nm b. 874 nm d. 359 nm
Exclusion Principle: Which one of the following is the correct electronic configuration for the sodium atom, which has 11 electrons?
A. 1s1 2s2 3p6 2s2 B. 1s2 2s1 3p6 2s2 C. 1s1 2s2 2p6 2s2 D. 1s2 2s2 2p6 3s2 E. 1s2 2s2 2p6 3s1