What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electroweak force?
A)The most advanced telescopes are able to see back to this era in the universe.
B)Detectors on Earth have received photons and high-energy particles from this era.
C)Temperatures in the center of the Sun can reproduce the conditions during this era.
D)Particle accelerators on Earth can reach energies equivalent to the high temperatures of this era and have produced particles predicted by the electroweak theory.
E)We have no direct evidence of the electroweak force.

Question

Quizplus · Accepted Answer

Particle accelerators on Earth can reach energies equivalent to the high temperatures of the early universe, and through these accelerators, we have produced particles predicted by the electroweak theory. This provides direct evidence that the weak and electromagnetic forces were once unified as a single electroweak force. Option A is incorrect because telescopes cannot see back to the era when the forces were unified. Option B is incorrect because detectors on Earth cannot receive photons and high-energy particles from that era because they would have been absorbed or scattered by the intervening matter. Option C is incorrect because the Sun's core temperature is high enough to produce nuclear fusion reactions but not high enough to reproduce the conditions during the early universe. Option E is incorrect because we do have direct evidence of the electroweak force.

What Direct Evidence Do We Have That the Weak and Electromagnetic