Interstellar gas is composed of:
A) only hydrogen.
B) 90% hydrogen, 9% helium by weight.
C) 10% hydrogen, 90% helium by numbers of atoms.
D) some hydrogen, but mainly carbon dioxide.
E) ammonia, methane, and water vapor.
B
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A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400.00 Hz. The sound he hears reflected back from the wall is at a frequency 408.00 Hz
At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s. A) 3.68 m/s B) 333 m/s C) 6.67 m/s D) 6.80 m/s E) 3.37 m/s
The process of _______________ depends partly on the presence of short-lived radioactive elements whose rapid decay would have released enough heat to melt the interior of planets
Fill in the blank(s) with correct word
Brownian motion is caused by
A) thermal agitation. B) perpetual motion. C) particles larger than atoms bumping into them. D) interactions between atoms and molecules. E) almost invisible bugs.
The ionized helium lines show up only in class ________ stars
A) K B) B C) O D) M E) F