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Author Question: Work done within an isolated system can increase the energy of the system. Indicate whether the ... (Read 104 times)

fbq8i

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on: Jul 28, 2018
Work done within an isolated system can increase the energy of the system.
  Indicate whether the statement is true or false

Question 2

About how old was the universe when the microwave background radiation that Penzias and Wilson discovered first became visible?
 a. 1 microsecond (10-6 second) when the electromagnetic force separated out from the electroweak force.
  b. 3 minutes, the start of the period that ended with typical photons unable to produce electron-positron pairs.
  c. 300 thousand years, when matter in the universe became transparent to photons.
  d. 1 million years, when the strong force separated out.
  e. 30 million years, when the strong force separated out.


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ryhom

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Reply #1 on: Jul 28, 2018
Answer to Question 1

F

Answer to Question 2

c


fbq8i

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Reply 2 on: Jul 28, 2018
Gracias!

komodo7

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Reply 3 on: Yesterday
Wow, this really help

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