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 57 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
Great answer, keep it coming :)

amandalm

  • Member
  • Posts: 306
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

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?

Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

Did you know?

Cyanide works by making the human body unable to use oxygen.

The absorption of light energy by pigment molecules in the light-harvesting complex, and the path th The absorption of light energy by pigment molecules in the light-harvesting complex, and the path th
Solar Energy Input Varies with Latitude Solar Energy Input Varies with Latitude
An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ... An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ...
energy of interaction and distance of particle energy of interaction and distance of particle
Light energy from the Sun powers Light energy from the Sun powers
Expressing amounts of energy in different energy units is necessary to solve many chemistry ... Expressing amounts of energy in different energy units is necessary to solve many chemistry ...
Video: Hormonal feedback loop components & Glucagon (glycogenolysis and gluconeogenesis)

For a complete list of videos, visit our video library