This topic contains a solution. Click here to go to the answer

Author Question: Astronomers have identified more and more black holes in recent years by using x-ray imaging. If ... (Read 69 times)

jenna1

  • Hero Member
  • *****
  • Posts: 568
Astronomers have identified more and more black holes in recent years by using x-ray imaging. If black holes are supposed to be black and not emit light, where are the x rays coming from?
  a. The accretion disk is full of accelerating atoms, which emit electromagnetic radiation as they accelerate.
  b. The friction within the accretion disk heats the gas to very high temperatures, and the gas emits x rays according to its characteristic spectrum.
  c. Hawking radiation not captured by the black hole knocks out K shell electrons within the accretion disk and the matter emits characteristic x rays.
  d. Scientists suspect that many of the supposed black holes are indeed neutron stars that emit x-ray radiation.
  e. Gravitational waves coming from the black hole are thought to interact with matter in the accretion disk, exciting many of the atoms into producing x rays.

Question 2

Frame dragging is a complex consequence of general relativity. It can be simplified into a classical analog, however, demonstrated by which of the following situations?
 
a. A merry-go-round spins objects further from the center of rotation at faster linear speeds.
  b. A flamenco dancer's dress as she spins quickly a full turn.
  c. An elevator falling in a uniform gravitational field that has a hole in it to let light through.
  d. A rubber sheet with a heavy ball at rest and a rolling ball with its trajectory changed by the depression in the sheet.
  e. A figure skater in a spin moves her arms closer to her body and the rate of spin increases.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

peilian

  • Sr. Member
  • ****
  • Posts: 316
Answer to Question 1

b.
It has been well established that x rays are emitted by black holes. Scientists suspect that the radiation comes from superheated gas in orbit falling into the black hole.

Answer to Question 2

b.
The dress of a flamenco dancer as she does a spin is like the fabric of spacetime when dragging about a massive rotating body




peilian

  • Sr. Member
  • ****
  • Posts: 316

 

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Did you know?

Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.

Did you know?

Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

For a complete list of videos, visit our video library