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 66 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 :)


mjenn52

  • Member
  • Posts: 351
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

 

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

Did you know?

When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

Did you know?

The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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.

For a complete list of videos, visit our video library