Why is the energy source for active nuclei like Seyferts thought to be compact?
A) The light can vary over short time intervals.
B) Their energy appears to be non-stellar synchrotron radiation.
C) We know the masses of the black holes that lurk there, and can find their radii.
D) They are all strong radio sources, with assigned frequencies by their sizes.
E) The sources appear to be single stars in photos.
A
You might also like to view...
What is the CNO cycle?
A) the process by which helium is fused into carbon, nitrogen, and oxygen B) the process by which carbon is fused into nitrogen and oxygen C) the set of fusion reactions that have produced all the carbon, nitrogen, and oxygen in the universe D) a set of steps by which four hydrogen nuclei fuse into one helium nucleus
What kind of light warms the stratosphere?
a. infrared b. visible c. ultraviolet
How are radio waves generated? How are they detected? What do you think limits the highest radio frequency that can be generated?
By what primary heat transfer mechanism does one end of an iron bar become hot when the other end is placed in a flame?
A) natural convection B) conduction C) radiation D) forced convection E) countercurrent.