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

Author Question: In the standard model, about when after the Big Bang did the universe become transparent to ... (Read 175 times)

KimWrice

  • Hero Member
  • *****
  • Posts: 579
on: Jul 29, 2018
In the standard model, about when after the Big Bang did the universe become transparent to radiation?
 
  A)
 
  10-43 s
  B)
 
  10-35 s
  C)
 
  103 s
  D)
 
  3  105 y
  E)
 
  3  106 y

Question 2

According to the selection rule, when a photon is emitted or absorbed, transitions can only occur between state with values of  that differ by
 
  A)
 
  five units.
  B)
 
  four units.
  C)
 
  three units.
  D)
 
  two units.
  E)
 
  one unit.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Cheesycrackers

  • Sr. Member
  • ****
  • Posts: 333
Reply #1 on: Jul 29, 2018
Answer to Question 1

D

Answer to Question 2

E


KimWrice

  • Hero Member
  • *****
  • Posts: 579
Reply #2 on: Jul 29, 2018
Thanks


Cheesycrackers

  • Sr. Member
  • ****
  • Posts: 333
Reply #3 on: Jul 29, 2018
Welcome :)


« previous next »
 

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Did you know?

One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

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.

Did you know?

The average office desk has 400 times more bacteria on it than a toilet.

This graphic illustrates the original systems model of politics advanced by David Easton. Politics This graphic illustrates the original systems model of politics advanced by David Easton. Politics
Wright's Modification of Marx's Model Of The Social Classes Wright's Modification of Marx's Model Of The Social Classes
Roberts's Assessment, Crisis Intervention, and Trauma Treatment (ACT) model. Roberts's Assessment, Crisis Intervention, and Trauma Treatment (ACT) model.
Standard precaution guidelines. Additional guidelines/protocols may be utilized depending on the ... Standard precaution guidelines. Additional guidelines/protocols may be utilized depending on the ...
Structural model of the Cro dimer–operator complex Structural model of the Cro dimer–operator complex
Model for ecosystems on land Model for ecosystems on land
Video: Carbohydrate digestion - mouth and stomach & pancreas and small intestine

For a complete list of videos, visit our video library