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.
B
Physics & Space Science
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A seagull flying at 10 km/h in a 10-km/h crosswind has a resultant speed of
A) 10 km/h. B) about 14 km/h. C) 20 km/h. D) more than 20 km/h.
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Which of the following is the best object to use as a point of reference for describing the location of the parked car?
A. the bird B. the streetlight C. the store D. the tree
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What is the formula of a compound formed from the ions M3+ and X2-?
a. M2X b. MX c. M2X3 d. MX2
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State the general rule for the interaction of magnetic poles
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