At extremely high temperatures (e.g., millions of degrees), which of the following best describes the phase of matter?
A) a gas of rapidly moving molecules
B) a plasma consisting of positively charged ions and free electrons
C) a gas consisting of individual, neutral atoms, but no molecules
D) a plasma consisting of rapidly moving, neutral atoms
E) matter cannot exist at extremely high temperatures.
B) a plasma consisting of positively charged ions and free electrons
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What is the monolithic collapse hypothesis unable to explain?
a. The randomly oriented, elongated orbits of stars in the bulge and halo b. The circular motion of stars in the galactic disk c. The difference in metallicity between the spherical component and the disk component of the galaxy d. The elongated bar shape of the central bulge e. The low density of material in the halo, compared to the central bulge
Compared to ultraviolet waves, the frequency of infrared waves is
A) lower. B) the same. C) higher.
The crucial test of whether a compound is ionic is whether, when melted, it ______________
Fill in the blank(s) with correct word
A bar magnet is held in a vertical orientation above a loop of wire that lies in the horizontal plane as shown in Figure OQ31.7. The south end of the magnet is toward the loop. After the magnet is dropped, what is true of the induced current in the loop as viewed from above?