Multiple Choice
In the standard model of the expansion of the universe, the total energy of a standard mass m is assumed to be zero. When we solve the resulting energy equation for the critical mass density of the universe, we find that the critical mass density is given by
A) .
B) .
C) .
D) .
E) .
Correct Answer:

Verified
Correct Answer:
Verified
Q24: A photon with an energy of Eγ
Q25: Which of the following reactions cannot occur?<br>A)
Q26: Which of the following particle reactions cannot
Q27: According to string theory, six space-time dimensions
Q28: The acceleration (or deceleration) of the expansion
Q30: The strong nuclear interaction has a range
Q31: In this course we have seen that
Q32: The attractive force between protons and neutrons
Q33: The omega-minus particle decays <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB8245/.jpg" alt="The
Q34: A proton and an antiproton each with