What evidence supports the galactic fountain model?
A) We see a jet of ionized gas shooting out of the bulge of our galaxy.
B) We have mapped several spiral arms of the Milky Way Galaxy.
C) We see hot gas above the disk of the galaxy and cool gas that appears to be raining down from the halo.
D) We have observed a lot of water molecules in the interstellar medium.
E) We have no evidence yet for the galactic fountain model.
C
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In the atmospheres of the jovian planets, this component increases, systematically, with distance from the Sun
A) Hydrogen B) Helium C) Methane D) Ammonia E) Nitrogen
Two strings of identical material and radius are stretched with the same tension with their ends fixed, but one string is 8.0 mm longer than the other. Waves on these strings propagate at 420 m/s
The fundamental frequency of the longer string is 528 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency? A) 22 Hz B) 11 Hz C) 16 Hz D) 5.5 Hz E) 27 Hz
Coil A is close to, but not touching, coil B. If a steady counterclockwise 100-A current flows in coil A, what can you say about the induced current in coil B?
A) The current in coil B will be equal to 100 A clockwise. B) The current in coil B will be equal to 100 A counterclockwise. C) The current in coil B will be counterclockwise and less than 100 A, but not zero. D) The current in coil B will be clockwise and less than 100 A, but not zero. E) There will be no induced current in coil B.
Polonium-216 decays to lead-212 by emitting what kind of nuclear radiation?
A) Alpha B) Beta minus C) Beta plus D) Gamma E) X-rays.