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 98 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?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Did you know?

A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.

Did you know?

The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

In 1844, Charles Goodyear obtained the first patent for a rubber condom.

The standard protocol of a metagenomics experiment. The standard protocol of a metagenomics experiment.
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
A model for formation of a minimal preinitiation complex (PIC) for pol II on a TATA promoter A model for formation of a minimal preinitiation complex (PIC) for pol II on a TATA promoter
Global Climate Model Global Climate Model
Generalized model of semiconservative replication of DNA Generalized model of semiconservative replication of DNA
The sliding-filament model The sliding-filament model
Video: Non-polar compounds - insolubility

For a complete list of videos, visit our video library