What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm
B) 3.0 cm
C) 4.0 cm
D) 5.0 cm
E) 6.0 cm
Answer: C
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What is the momentum of a 600. nm photon?
A) 2.07 N-s B) 2.07 eV/c C) 2.07 KeV/c D) 2.07 MeV/c E) 2.07 kN-m
According to your textbook, popular confusion is lessened when applying Heisenberg's uncertainty principle by heeding the distinction between
A) momentum and energy. B) energy and time. C) passive observation and probing.
In ancient times permanent magnets were known to the Greeks. These magnets were chunks of iron ore now called magnetite. What is the older name for this material?
A. magnesia B. lodestone C. oersted D. compass E. None of these choices are correct.
The four visible colors emitted by hydrogen atoms are produced by electrons
a. that start in the ground state. b. that end up in the ground state. c. that start in the level with n = 2. d. that end up in the level with n = 2.