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

Author Question: Which of these is NOT a source of the shock waves that lead to protostars? A) radiation from the ... (Read 44 times)

misspop

  • Hero Member
  • *****
  • Posts: 540
on: Jul 27, 2018
Which of these is NOT a source of the shock waves that lead to protostars?
 
  A) radiation from the OB stars in emission nebulae
  B) expanding Herbig-Haro objects
  C) expanding planetary nebula shells
  D) violent supernovae explosions
  E) collisions between galaxies

Question 2

Relate the temperature of the Big Bang to pair production in the quark and lepton epochs.
 
  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

polinasid

  • Sr. Member
  • ****
  • Posts: 344
Reply #1 on: Jul 27, 2018
Answer to Question 1

B

Answer to Question 2

The higher the temperature, the greater the energy of the colliding photons, and the heavier the particle-antiparticle pairs created; hence heavier protons and neutrons formed in the quark epoch before the lighter electrons in the lepton epoch.


misspop

  • Member
  • Posts: 540
Reply 2 on: Jul 27, 2018
Excellent

xoxo123

  • Member
  • Posts: 335
Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

« previous next »
 

Did you know?

All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

Did you know?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Did you know?

Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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?

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.

Ammonium as an energy source for chemoautotrophic bacteria in soil. Ammonium as an energy source for chemoautotrophic bacteria in soil.
cardiogenic shock cardiogenic shock
Crying Frequency in the Early Months In their first months of life, infants often cry for no appare Crying Frequency in the Early Months In their first months of life, infants often cry for no appare
The Upper Troposphere: Rossby Waves The Upper Troposphere: Rossby Waves
What Happens to Incoming Solar Radiation? What Happens to Incoming Solar Radiation?
Electrophoresis gel in a densitometer. (a) The green light from the slit light source is visible ... Electrophoresis gel in a densitometer. (a) The green light from the slit light source is visible ...
Video: Bipolar Disorder

For a complete list of videos, visit our video library