A fluorescent bulb emits what kind of spectrum?
A. absorption-line
B. blueshifted
C. continuous
D. redshifted
E. emission-line
Answer: E
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Which of the following is true of quasars?
A) Quasar eruptions became less common as galaxies became more stable. B) Quasars did not exist until about five billion years ago. C) Quasars have comparatively smaller look-back time than most galaxies. D) Quasars eruptions were not common when galaxies were actively forming and colliding.
What evidence suggests that some of the stars in the halo of the Milky Way Galaxy came from mergers with other galaxies?
A) Globular clusters are typically found only in the halo. B) Some halo stars with similar and distinct chemical compositions move together in organized streams. C) Some halo stars are older than our Galaxy. D) Halo stars have randomly oriented orbits.
Jacques and George meet in the middle of a lake while paddling in their canoes. They come to a complete stop and talk for a while. When they are ready to leave, Jacques pushes George's canoe with a force to separate the two canoes
What is correct to say about the final momentum and kinetic energy of the system if we can neglect any resistance due to the water? A) The final momentum is in the direction of but the final kinetic energy is zero. B) The final momentum is in the direction opposite of but the final kinetic energy is zero. C) The final momentum is in the direction of and the final kinetic energy is positive. D) The final momentum is zero and the final kinetic energy is zero. E) The final momentum is zero but the final kinetic energy is positive.
Why is iron significant to understanding how a supernova occurs?
A) Iron is the heaviest of all atomic nuclei, and thus no heavier elements can be made. B) Supernovae often leave behind neutron stars, which are made mostly of iron. C) The fusion of iron into uranium is the reaction that drives a supernova explosion. D) Iron cannot release energy either by fission or fusion.