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Which two of the basic forces become indistinguishable at extremely high density and temperature?
AThe gravitational and the strong nuclear forces
BThe electromagnetic and the weak nuclear forces
CThe strong nuclear and the weak nuclear forces
DThe gravitational and the electromagnetic forces
Answer & Solution
Correct answer: B. The electromagnetic and the weak nuclear forces
1. Physicists have long looked for connections between the basic forces.
2. At the extremely high density and temperature of the early universe, two of them merge.
3. The electromagnetic and weak nuclear forces become indistinguishable under those conditions.
4. Together they are then called the electroweak force.
5. Bringing gravity into such a scheme is proving much harder.
_Source: OpenStax College Physics (CC BY 4.0), Ch 4 "Dynamics: Force and Newton's Laws of Motion", section 4.8 Extended Topic: The Four Basic Forces_
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