What is basalt?
A) any substance that evaporates easily and is a gas, liquid, or ice on Earth
B) a type of rock that makes relatively low-viscosity lava
C) a type of metal that tends to create stratovolcanoes when eruptions occur
D) a type of mineral that is the main ingredient of sea salt
E) another name for lava
B
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The diagram illustrates a light source, a gas cloud, and three different lines of sight. Along which line of sight would an observer see an absorption spectrum?
a. 1
b. 2
c. 3
d. 2 and 3
e. none of them
Standing Sound Waves: An organ pipe closed at one end and open at the other end has two successive harmonics with frequencies of 2170 Hz and 2790 Hz. What is the fundamental frequency of the pipe?
Fill in the blank(s) with the appropriate word(s).
Charge is distributed uniformly on the surface of a spherical nonconducting shell. A point particle with charge q is inside. The electrical force on the particle q is least when:
A) it is near the inside surface of the shell B) it is at the center of the shell C) it is halfway between the shell center and the inside surface D) it is near, but not at, the center of the shell E) all of the above (the force is zero everywhere inside)
How do elliptical galaxies typically compare to spiral galaxies?
A) Elliptical galaxies are redder and rounder. B) Elliptical galaxies are redder and flattened. C) Elliptical galaxies are bluer and rounder. D) Elliptical galaxies are bluer and flattened. E) Elliptical galaxies are always much smaller.