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Author Question: Which of these is NOT a source of the shock waves that lead to protostars? A) radiation from the ... (Read 39 times)

misspop

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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?


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polinasid

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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

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

samiel-sayed

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Reply 3 on: Yesterday
:D TYSM

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