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

Author Question: Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger ... (Read 76 times)

roselinechinyere27m

  • Hero Member
  • *****
  • Posts: 557
on: Jul 27, 2018
Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger the longer their period of variation is?
 
  a. Henrietta Leavitt
  b. Edwin Hubble
  c. John Glenn
  d. Carl Sagan
  e. Harlow Shapley

Question 2

How does an H-R diagram make it clear that giant stars are larger than main-sequence stars of the same temperature?
 
  What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

joanwhite

  • Sr. Member
  • ****
  • Posts: 308
Reply #1 on: Jul 27, 2018
Answer to Question 1

a

Answer to Question 2

The relationship among luminosity, radius, and temperature tells us that luminosity is proportional to the surface area and to the temperature. The H-R diagram shows the luminosity vs. temperature, and the giant stars are in the top left corner, meaning greater luminosity and lower temperature. So their surface areas, and therefore radii, must be larger.


roselinechinyere27m

  • Member
  • Posts: 557
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

scikid

  • Member
  • Posts: 300
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

Did you know?

The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.

Did you know?

Approximately 500,000 babies are born each year in the United States to teenage mothers.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.

Energy of Electron according to Electron Shells Energy of Electron according to Electron Shells
The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing The same star field photographed with (a) a ground-based telescope, which is subject to poor seeing
Energy flow and chemical cycling Energy flow and chemical cycling
The energy budget The energy budget
Rapid growth in the use of alternative energy seems impressive Rapid growth in the use of alternative energy seems impressive
Potential energy Potential energy
Video: Congenital Heart Defects Animation

For a complete list of videos, visit our video library