This topic contains a solution. Click here to go to the answer

Author Question: Who first determined that the energy/s emitted by (luminosity of) Cepheid variable stars is larger ... (Read 35 times)

roselinechinyere27m

  • Hero Member
  • *****
  • Posts: 557
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
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
Great answer, keep it coming :)


komodo7

  • Member
  • Posts: 322
Reply 3 on: Yesterday
Wow, this really help

 

Did you know?

Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

Did you know?

Carbamazepine can interfere with the results of home pregnancy tests. If you are taking carbamazepine, do not try to test for pregnancy at home.

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?

The average adult has about 21 square feet of skin.

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.

For a complete list of videos, visit our video library