Who was the discoverer of radioactivity?
A. Neils Bohr
B. Marie Curie
C. Albert Einstein
D. Henri Becquerel
E. Richard Feynman
D. Henri Becquerel
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An elevator suspended by a vertical cable is moving downward but slowing down. The tension in the cable must be
A) equal to the weight of the elevator. B) less than than the weight of the elevator. C) greater than the weight of the elevator.
How does the unified model of AGN explain blazars?
a. Blazars are Seyferts galaxies seen edge on. b. Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. c. Blazars are relativistic jets from an AGN pointed toward our light of sight. d. Blazars are newly formed AGN from a recently galactic collision.
In the context of the unified model of active galactic nuclei (AGN), you will be able to see the broad-line region if the accretion disk of a galaxy is tipped slightly
Indicate whether the statement is true or false
Which of the following correctly arranges the layers of Earth’s atmosphere from closest to the surface to closest to space?
a. troposphere, stratosphere, exosphere, thermosphere b. stratosphere, exosphere, thermosphere, troposphere c. troposphere, stratosphere, thermosphere, exosphere d. thermosphere, troposphere, stratosphere, exosphere