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Author Question: To fully describe the apparent motion of the planets in the sky, Ptolemy's model invoked A) ... (Read 71 times)

FButt

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on: Jul 27, 2018
To fully describe the apparent motion of the planets in the sky, Ptolemy's model invoked
 
  A) ellipses.
  B) constant speeds.
  C) a heliocentric view.
  D) epicycles.
  E) Occam's Razor.

Question 2

What is the antimatter problem in pair production?
 
  What will be an ideal response?


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Brenm

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Reply #1 on: Jul 27, 2018
Answer to Question 1

D

Answer to Question 2

Where did the antiparticles go? If as many anti-neutrons were created as neutrons, and they were all annihilated, why are there any normal neutrons around today to build atomic nuclei?


FButt

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Reply #2 on: Jul 27, 2018
Thanks


Brenm

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Reply #3 on: Jul 27, 2018
Welcome :)


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