« previous next »

Author Question: As a star forms, the photosphere first appears: A) when the planetary nebula is expelled. B) ... (Read 46 times)

Lisaclaire

  • Hero Member
  • *****
  • Posts: 569
on: Jul 27, 2018
As a star forms, the photosphere first appears:
 
  A) when the planetary nebula is expelled.
  B) when the protostar forms.
  C) when contraction slows down.
  D) when nuclear fires ignite.
  E) when the star reaches the main sequence.

Question 2

The particles which enter into chemical reactions are the atom's:
 
  A) protons.
  B) neutrons.
  C) positrons.
  D) electrons.
  E) mesons.


amandanbreshears

  • Sr. Member
  • ****
  • Posts: 320
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

D


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

Did you know?

The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.

Did you know?

For pediatric patients, intravenous fluids are the most commonly cited products involved in medication errors that are reported to the USP.

Did you know?

According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).

Did you know?

Your chance of developing a kidney stone is 1 in 10. In recent years, approximately 3.7 million people in the United States were diagnosed with a kidney disease.

The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis The reflection nebula NGC 1999 is brilliantly illuminated by V380 Orionis
Formation of a Bipolar Planetary Nebula Formation of a Bipolar Planetary Nebula
Simple harmonic motion also forms the basis for understanding mechanical waves Simple harmonic motion also forms the basis for understanding mechanical waves
Distribution and Forms of Precipitation: Snow Distribution and Forms of Precipitation: Snow
How Precipitation Forms How Precipitation Forms
Different forms of a gene are called alleles Different forms of a gene are called alleles
Video: Stomach peristalsis - Movement of Food Through the Small Intestine

For a complete list of videos, visit our video library