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

Author Question: When does a star become a main-sequence star? A) when the protostar assembles from a molecular ... (Read 118 times)

cdr_15

  • Hero Member
  • *****
  • Posts: 546
on: Jul 27, 2018
When does a star become a main-sequence star?
 
  A) when the protostar assembles from a molecular cloud
  B) the instant when hydrogen fusion first begins in the star's core
  C) when the rate of hydrogen fusion within the star's core is high enough to maintain gravitational equilibrium
  D) when a star becomes luminous enough to emit thermal radiation
  E) when hydrogen fusion is occurring throughout a star's interior

Question 2

The temperature of the layer of gas that produces the visible light of the Sun is
 
  A) 3,500 K
  B) 5,800 K
  C) 12,300 K
  D) 300,000 K
  E) 15 million K


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

ApricotDream

  • Sr. Member
  • ****
  • Posts: 336
Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

B


cdr_15

  • Member
  • Posts: 546
Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

carojassy25

  • Member
  • Posts: 299
Reply 3 on: Yesterday
Great answer, keep it coming :)

« previous next »
 

Did you know?

Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.

Did you know?

In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

Did you know?

Vaccines prevent between 2.5 and 4 million deaths every year.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Did you know?

Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.

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
Post–Main-Sequence Evolution Post–Main-Sequence Evolution
Alternative methods for locating the CPT Main Term. Alternative methods for locating the CPT Main Term.
Sequence Series Arithmatic Progression Problem Sequence Series Arithmatic Progression Problem
The effect of frameshift mutations on a DNA sequence repeating the triplet sequence GAG The effect of frameshift mutations on a DNA sequence repeating the triplet sequence GAG
Video: Inflammation

For a complete list of videos, visit our video library