« previous next »

Author Question: In a closed universe a beam of light will: A) come back to where it originated. B) continue on ... (Read 60 times)

segrsyd

  • Hero Member
  • *****
  • Posts: 530
on: Jul 27, 2018
In a closed universe a beam of light will:
 
  A) come back to where it originated.
  B) continue on forever.
  C) move on a circular path around its origin.
  D) reflect off the edge of the universe and come back.
  E) go on some strange path, never to return.

Question 2

The 21 cm line of hydrogen is strongly absorbed by interstellar dust.
 
  Indicate whether the statement is true or false


Juro

  • Sr. Member
  • ****
  • Posts: 337
Reply #1 on: Jul 27, 2018
Answer to Question 1

A

Answer to Question 2

FALSE


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question

segrsyd

  • Hero Member
  • *****
  • Posts: 530
Reply #2 on: Jul 27, 2018
Thank you!


Juro

  • Sr. Member
  • ****
  • Posts: 337
Reply #3 on: Jul 27, 2018
Always glad to help...


« previous next »
 

Did you know?

The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

Did you know?

The tallest man ever known was Robert Wadlow, an American, who reached the height of 8 feet 11 inches. He died at age 26 years from an infection caused by the immense weight of his body (491 pounds) and the stress on his leg bones and muscles.

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

Did you know?

Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.

Absorption of light energy by an electron Absorption of light energy by an electron
Closed urinary drainage system. Urine being measured after it leaves patient’s body via catheter. Closed urinary drainage system. Urine being measured after it leaves patient’s body via catheter.
Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ... Touch the test light to the negative (–) terminal of the battery or a good engine ground to check ...
When both sides of the back have been massaged, redrape the back. With light to moderate force, use ... When both sides of the back have been massaged, redrape the back. With light to moderate force, use ...
Testing Back Pressure with a Pressure Gauge Testing Back Pressure with a Pressure Gauge
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig
Video: Erythropoietin (EPO)

For a complete list of videos, visit our video library