« previous next »

Author Question: What are the common properties shared by most active galaxies and quasars? How do these properties ... (Read 125 times)

joe

  • Hero Member
  • *****
  • Posts: 627
on: Jul 27, 2018
What are the common properties shared by most active galaxies and quasars? How do these properties lead to an understanding of the central engine?
 
  What will be an ideal response?

Question 2

The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
 
  A) The star is not rotating.
  B) This is an example of the photoelectric effect.
  C) This is an example of the Doppler effect.
  D) The star has a radial velocity towards us.
  E) The second law of Kirchhoff explains this.


catron30

  • Sr. Member
  • ****
  • Posts: 297
Reply #1 on: Jul 27, 2018
Answer to Question 1

All active galaxies and quasars emit massive quantities of radio- and infrared-wavelength energy in a non-blackbody spectrum from a very small (solar-system-sized) source. This can be understood if they are powered by the energy produced when matter falls into a supermassive black hole.

Answer to Question 2

C


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Chronic necrotizing aspergillosis has a slowly progressive process that, unlike invasive aspergillosis, does not spread to other organ systems or the blood vessels. It most often affects middle-aged and elderly individuals, spreading to surrounding tissue in the lungs. The disease often does not respond to conventionally successful treatments, and requires individualized therapies in order to keep it from becoming life-threatening.

Did you know?

Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

Did you know?

Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

Did you know?

In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Distant Galaxies Distant Galaxies
Common skin signs are often evidence of an illness or disorder. A vesicle is a small fluid filled ... Common skin signs are often evidence of an illness or disorder. A vesicle is a small fluid filled ...
Common phlebotomy issues. Common phlebotomy issues.
Common Latin Abbreviation Common Latin Abbreviation
Active Transport in Vesicles: Phagocytosis Active Transport in Vesicles: Phagocytosis
Staphylococcus epidermidis, a common colonizer of human skin. Staphylococcus epidermidis, a common colonizer of human skin.
Video: Alzheimer's Disease

For a complete list of videos, visit our video library