About what was the temperature of the universe when a typical cosmic microwave background radiation photon was no longer able spontaneously to create an electron and positron pair?
A) 1000 K
B) 100,000 K
C) 1 million K
D) 1 billion K
Correct Answer:
Verified
Q33: If Wmₐttₑᵣ + WL = 1 today
Q35: Inflation happened when:
A) the universe was <10-33
Q36: If multiverses exist,which of the following is
Q37: Whether or not parallel universes exist is
Q37: How would astronomers describe the antiparticle of
Q39: At what stage in the universe's history
Q42: Why does the sum of Wmₐss and
Q43: Soon after the Big Bang,we believe the
Q81: Explain why astronomers cannot accurately model the
Q90: Describe the four fundamental forces of nature
Unlock this Answer For Free Now!
View this answer and more for free by performing one of the following actions
Scan the QR code to install the App and get 2 free unlocks
Unlock quizzes for free by uploading documents