« previous next »

Author Question: In a closed universe a beam of light will: A) come back to where it originated. B) continue on ... (Read 43 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?

Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.

Did you know?

Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.

Did you know?

No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.

Did you know?

Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

Did you know?

Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.

Excitation of isolated chlorophyll by light. Excitation of isolated chlorophyll by light.
Assessment of Light Touch Assessment of Light Touch
Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d
Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth Blue light is scattered more than other wavelengths by the gases in the atmosphere, giving the Earth
Back muscles Back muscles
Ayurvedic massage. Pressing the ansa marma on the front and back of the shoulders with recipient ... Ayurvedic massage. Pressing the ansa marma on the front and back of the shoulders with recipient ...
Video: Mendel's Principles of Dominance, Segregation and Independent Assortment

For a complete list of videos, visit our video library