This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How does gravitational lensing tell us about the mass of a galaxy cluster? A) The lensing ... (Read 46 times)

jon_i

  • Hero Member
  • *****
  • Posts: 549
on: Jul 27, 2018
How does gravitational lensing tell us about the mass of a galaxy cluster?
 
  A) The lensing broadens spectral lines, and we can use the broadening to weigh the cluster.
  B) Using Einstein's general theory of relativity, we can calculate the cluster's mass from the precise way in which it distorts the light of galaxies behind it.
  C) The lensing allows us to determine the orbital speeds of galaxies in the cluster, so that we can determine the mass of the cluster from the orbital velocity law.
  D) Newton's universal law of gravitation predicts how mass can distort light, so we can apply Newton's law to determine the mass of the cluster.

Question 2

What are the standard units for luminosity?
 
  A) Watts
  B) Newtons
  C) Joules
  D) kilograms
  E) Watts per second


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Jayson

  • Sr. Member
  • ****
  • Posts: 350
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

A


jon_i

  • Member
  • Posts: 549
Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

zacnyjessica

  • Member
  • Posts: 345
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Peculiar Galaxy NGC 5128 (Centaurus A) Peculiar Galaxy NGC 5128 (Centaurus A)
Gravitational Lensing of Quasars Gravitational Lensing of Quasars
The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha The recent mass upheavals in Tunisia, Egypt, Libya, Yemen, and Syria gave political scientists a cha
This five-wire mass air flow sensor consists of a metal foil sensing unit, an intake air temperature ... This five-wire mass air flow sensor consists of a metal foil sensing unit, an intake air temperature ...
The DNA from one chromosome has a mass of ~20 billion Daltons The DNA from one chromosome has a mass of ~20 billion Daltons
Mass spectrometry of a synthetic version of collagen peptide Mass spectrometry of a synthetic version of collagen peptide
Video: Allergic Rhinitis

For a complete list of videos, visit our video library