The magnetic fields carried by jets coming from active galactic nuclei are generated by
A) the combined magnetic fields of the many stars near the galaxy's center.
B) the central black hole.
C) the movement of the interstellar matter of the galaxy.
D) the movement of the stars in the galaxy.
E) charged matter in the accretion disk of the central black hole.
E
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If all of the mass in the galaxy were concentrated at its center, then orbital velocity would be high near the center and would decline away from the center
Indicate whether the statement is true or false
The high luminosity of a Seyfert galaxy____
a. comes from the halo of the galaxy b. is distributed through the spiral arms c. is spread through the central bulge d. is concentrated in a very small region of the nucleus e. varies over the course of years
An ideal gas is kept in a rigid container that expands negligibly when heated. The gas starts at a temperature of 20.0°C, and heat is added to increase its temperature
At what temperature will its root-mean-square speed (thermal speed) be double its value at 20.0°C? A) 40.0°C B) 141°C C) 313°C D) 400°C E) 899°C
Current is the opposition to the flow of charge
Indicate whether the statement is true or false