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).
B. A single quantum energy state embraces both positive and negative values for each momentum component.
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An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting?
a. It goes up, overflowing. b. It stays the same. c. It goes down. d. It depends on air pressure, thus the answer is indeterminate.
The three common phases of matter on Earth are ________, ___________, and _______
Fill in the blank(s) with correct word
A particle with non-zero kinetic energy will
A. always have the same wavelength as the same energy photon. B. always have a greater wavelength than the same energy photon. C. always have a shorter wavelength than the same energy photon. D. sometimes have a greater wavelength than the same energy photon. E. sometimes have a shorter wavelength than the same energy photon.
The event horizon marks the boundary within which the density is roughly the same as that of the atomic nucleus
a. True b. False Indicate whether the statement is true or false