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

Author Question: The look-back time is a. the time it takes for the light from an object to reach Earth. b. ... (Read 100 times)

vinney12

  • Hero Member
  • *****
  • Posts: 586
on: Jul 27, 2018
The look-back time is
 
  a. the time it takes for the light from an object to reach Earth.
  b. numerically equal to the distance in light-years.
  c. smaller for more distant objects.
  d. All of the other choices are correct.
  e. the time it takes for the light from an object to reach Earth and numerically equal to the distance in light-years.

Question 2

HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas.
 
  a. True
  b. False
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

flexer1n1

  • Sr. Member
  • ****
  • Posts: 373
Reply #1 on: Jul 27, 2018
Answer to Question 1

e

Answer to Question 2

False


vinney12

  • Member
  • Posts: 586
Reply 2 on: Jul 27, 2018
Excellent

patma1981

  • Member
  • Posts: 292
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Did you know?

This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

Did you know?

Pink eye is a term that refers to conjunctivitis, which is inflammation of the thin, clear membrane (conjunctiva) over the white part of the eye (sclera). It may be triggered by a virus, bacteria, or foreign body in the eye. Antibiotic eye drops alleviate bacterial conjunctivitis, and antihistamine allergy pills or eye drops help control allergic conjunctivitis symptoms.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

The Sun as it appears from the surface of the Earth at Sunset. The Sun as it appears from the surface of the Earth at Sunset.
Fun with light refraction Fun with light refraction
Cutaway Model of Earth Cutaway Model of Earth
Lightning on Earth Lightning on Earth
Reflection of light rays Reflection of light rays
Grand Funk Railroad - Bad Time Grand Funk Railroad - Bad Time
Video: Summary of glucose catabolism

For a complete list of videos, visit our video library