« previous next »

Author Question: What are the common properties shared by most active galaxies and quasars? How do these properties ... (Read 83 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?

More than 4.4billion prescriptions were dispensed within the United States in 2016.

Did you know?

The human body produces and destroys 15 million blood cells every second.

Did you know?

Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.

Did you know?

The average older adult in the United States takes five prescription drugs per day. Half of these drugs contain a sedative. Alcohol should therefore be avoided by most senior citizens because of the dangerous interactions between alcohol and sedatives.

Did you know?

Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.

Feral Rock Pigeons are common pests in public spaces in cities Feral Rock Pigeons are common pests in public spaces in cities
Some common functional groups of biomolecules Some common functional groups of biomolecules
Two general models for the interconversion of inactive and active forms of a protein during cooperat Two general models for the interconversion of inactive and active forms of a protein during cooperat
Spiral Galaxies Seen Nearly Edge On from the Milky Way Spiral Galaxies Seen Nearly Edge On from the Milky Way
Common Risk Factors Common Risk Factors
The CAMEO entry for chlorine. Useful information includes chemical and physical properties, personal ... The CAMEO entry for chlorine. Useful information includes chemical and physical properties, personal ...
Video: Carbohydrate digestion - mouth and stomach & pancreas and small intestine

For a complete list of videos, visit our video library