In the double-exhaust model, the radio lobes of a radio galaxy are inflated by
a. jets of excited gas flowing from the central galaxy.
b. jets of high energy sound waves flowing from the central galaxy.
c. a disk of ionized material that orbits very near a supermassive black hole.
d. dark clouds of very cold gas and dust.
e. none of the above
A
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A piece of iron sinks to the bottom of a lake where the pressure is 21 atm. Which statement best describes what happens to the density of that piece of iron?
A) There has been no change in the density of the iron. B) Its density decreases slightly. C) Its density increases slightly. D) Its density becomes 21 times greater.
At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A) Pluto B) Neptune C) Uranus D) Jupiter E) Saturn
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A tuning fork of frequency 200 hertz can resonate if an incident sound wave has a frequency of
A) 100 hertz. B) 200 hertz. C) both of these D) neither of these