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

Author Question: What information about protogalactic gas clouds is contained in quasar absorption lines? What ... (Read 54 times)

OSWALD

  • Hero Member
  • *****
  • Posts: 580
on: Jul 27, 2018
What information about protogalactic gas clouds is contained in quasar absorption lines?
 
  What will be an ideal response?

Question 2

You are in an airplane, traveling relative to the ground at 500 km/hr. You throw a baseball toward the front of the plane at a speed of 50 km/hr. How fast would someone on the ground say the baseball is moving?
 
  A) 550 km/hr
  B) 50 km/hr
  C) 500 km/hr
  D) 450 km/hr.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dpost18

  • Sr. Member
  • ****
  • Posts: 345
Reply #1 on: Jul 27, 2018
Answer to Question 1

Quasar absorption lines show the presence of massive clouds of neutral hydrogen between us and the quasar. The hydrogen absorption line is generally wider for higher redshifts, indicating that the most distant clouds are more massive than the older, closer clouds, which have, presumably, converted some of their gas to stars. The absorption lines of heavier elements are stronger, however, at lower redshift, suggesting that the older, closer galaxies have enriched their interstellar medium more than the more distant, younger objects.

Answer to Question 2

A


OSWALD

  • Member
  • Posts: 580
Reply 2 on: Jul 27, 2018
Excellent

bdobbins

  • Member
  • Posts: 326
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

Did you know?

Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

Did you know?

When taking monoamine oxidase inhibitors, people should avoid a variety of foods, which include alcoholic beverages, bean curd, broad (fava) bean pods, cheese, fish, ginseng, protein extracts, meat, sauerkraut, shrimp paste, soups, and yeast.

Did you know?

Eating carrots will improve your eyesight. Carrots are high in vitamin A (retinol), which is essential for good vision. It can also be found in milk, cheese, egg yolks, and liver.

Did you know?

All adverse reactions are commonly charted in red ink in the patient's record and usually are noted on the front of the chart. Failure to follow correct documentation procedures may result in malpractice lawsuits.

Information flows from the nucleus to the cytoplasm and back. Information flows from the nucleus to the cytoplasm and back.
The four processes of pharmacokinetics: absorption, distribution, metabolism, and excretion The four processes of pharmacokinetics: absorption, distribution, metabolism, and excretion
Risk of death from motorcycle accidents (dashed lines) and passenger accidents (solid lines) per 100 Risk of death from motorcycle accidents (dashed lines) and passenger accidents (solid lines) per 100
Clouds: Cloud Coverage and Observation Clouds: Cloud Coverage and Observation
Two wells are filled with different antigens and when they diffuse, they form lines that cross which ... Two wells are filled with different antigens and when they diffuse, they form lines that cross which ...
The Emergency Action Guide entry for styrene. Useful information includes emergency response ... The Emergency Action Guide entry for styrene. Useful information includes emergency response ...
Video: Endocytosis -Types and Phagocytosis

For a complete list of videos, visit our video library