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

Author Question: As the Universe cooled, it eventually reached a temperature of 3,000 K and protons were able to ... (Read 154 times)

lb_gilbert

  • Hero Member
  • *****
  • Posts: 588
on: Jul 27, 2018
As the Universe cooled, it eventually reached a temperature of 3,000 K and protons were able to capture and hold electrons to form neutral hydrogen. This process is known as
 
  a. ionization.
  b. isotropy.
  c. annihilation.
  d. recombination.
  e. hydration.

Question 2

A star begins fusing hydrogen to helium the moment it leaves the main sequence.
 
  a. True
  b. False
  Indicate whether the statement is true or false


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

princessflame2016

  • Sr. Member
  • ****
  • Posts: 298
Reply #1 on: Jul 27, 2018
Answer to Question 1

d

Answer to Question 2

False


lb_gilbert

  • Hero Member
  • *****
  • Posts: 588
Reply #2 on: Jul 27, 2018
Thanks


princessflame2016

  • Sr. Member
  • ****
  • Posts: 298
Reply #3 on: Jul 27, 2018
Welcome :)


« previous next »
 

Did you know?

Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

Did you know?

Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.

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?

To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.

Did you know?

Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

Selecting a Method for Measuring Body Temperature Selecting a Method for Measuring Body Temperature
Measuring Temperature Using a Temporal Artery Thermometer Measuring Temperature Using a Temporal Artery Thermometer
Temperature Means and Ranges Temperature Means and Ranges
Change in air temperature at various air flow rates for a 4 pass operation Change in air temperature at various air flow rates for a 4 pass operation
Energy imbalance establishes a temperature gradient between the tropics and the poles Energy imbalance establishes a temperature gradient between the tropics and the poles
Mathematics is the language of universe Mathematics is the language of universe
Video: Nucleic acid digestion -small intestine

For a complete list of videos, visit our video library