You are located at 40 degrees south latitude on Earth and the northern hemisphere is experiencing winter. Days for you are short whereas nights for you are long
a. True
b. False
Indicate whether the statement is true or false
False
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When counting particle-in-a-box quantum states in three dimensions, why do we divide the “volume” of only one eighth of a full spherical shell by the “volume” per quantum state? Why not the full shell’s volume?
A. Molecules in a gas can only have positive momentum components. B. A single quantum energy state embraces both positive and negative values for each momentum component. C. A particle’s momentum magnitude must be positive. D. The factor of 2 in the expression h/2L already counts both possible momentum signs. E. We really do include the full shell: the diagram only shows 1/8 of the shell to make it easier to draw. F. Some other reason (specify).
Spectra of stars often show narrow absorption lines from interstellar matter. What type of interstellar matter produces these?
A) dust B) neutral gas C) ionized gas D) molecules E) All of the above.
Compared to the star it evolved from, a white dwarf is
A) hotter and brighter. B) hotter and dimmer. C) cooler and brighter. D) cooler and dimmer. E) the same temperature and brightness.
How many electrons pass through a 20-? resistor in 10 min if there is a potential drop of 30 volts across it?
a. 5.6 × 10^21 b. 7.5 × 10^21 c. 9.4 × 10^21 d. 1.1 × 10^21 e. 3.8 × 10^21