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

Author Question: The period-luminosity relation for Cepheid variables was discovered in 1908 by A) William ... (Read 89 times)

jhjkgdfhk

  • Hero Member
  • *****
  • Posts: 569
on: Jul 27, 2018
The period-luminosity relation for Cepheid variables was discovered in 1908 by
 
  A) William Herschel.
  B) Henrietta Leavitt.
  C) Harlow Shapley.
  D) Heber Curtiss.
  E) Edwin Hubble.

Question 2

Hubble's constant is related to the age of the universe, but the precise relationship depends on the way in which the expansion rate changes with time.
 
  For a given value of Hubble's constant today (such as 24 km/s/Mly), the age of the universe is oldest if what is true? A) The expansion rate has remained nearly constant with time (a coasting universe).
  B) The expansion rate has slowed by the amount expected for a universe with the critical density (a critical universe).
  C) The expansion rate has been increasing with time (an accelerating universe).
  D) The expansion rate is slowing dramatically with time (a recollapsing universe).


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

nixon_s

  • Sr. Member
  • ****
  • Posts: 359
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

C


jhjkgdfhk

  • Member
  • Posts: 569
Reply 2 on: Jul 27, 2018
Excellent

kilada

  • Member
  • Posts: 311
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

There are 20 feet of blood vessels in each square inch of human skin.

Did you know?

Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.

Did you know?

Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

This girl ran four spinning machines in a cotton mill in Whitnel, North Carolina. Only 4 feet, 3 inc This girl ran four spinning machines in a cotton mill in Whitnel, North Carolina. Only 4 feet, 3 inc
The Events of the Germinal Period The Events of the Germinal Period
William Cameron Menzies, Storyboard for the burning-of-Atlanta scene from Gone with the Wind. William Cameron Menzies, Storyboard for the burning-of-Atlanta scene from Gone with the Wind.
Attributed to Thomas Dennis or William Searle, Chest, made in Ipswich, Massachusetts. Attributed to Thomas Dennis or William Searle, Chest, made in Ipswich, Massachusetts.
A recently discovered fossil of a missing evolutionary link is shown on the right, and a ... A recently discovered fossil of a missing evolutionary link is shown on the right, and a ...
Digital illustration of a fish that was believed to have become extinct during the Cretaceous Period Digital illustration of a fish that was believed to have become extinct during the Cretaceous Period
Video: Role of complement proteins

For a complete list of videos, visit our video library