What evidence tells us that the so-called "Martian meteorites" actually came from Mars?
A) Their chemical composition matches that of known Martian rocks.
B) Their ages match the known age of Mars.
C) Their color is the same as most Martian rocks.
D) Their composition tells us they formed farther from the Sun than Earth.
A) Their chemical composition matches that of known Martian rocks.
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If a star has an apparent magnitude of +5 and an absolute magnitude of -10, what can we say about that star? a. The star is farther than 10 parsecs away. b. The star is closer than 10 parsecs away. c. The star has a very large chromosphere. d. The star has a very large corona
e. The star is fainter than the Sun.
Which clock measures the shorter time interval between the synchronization and comparison events (or do both measure the same time)?
A. Clock A B. Clock B C. Both D. Neither
Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is
A) twice as great. B) the same. C) one-half as great. D) one-fourth as great. E) none of the above
An ionic compound composed of a cation other than H+ and an anion other than OH- is called a(n)
a. salt. b. precipitate. c. conjugate base. d. electrolyte.