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What happened to temperature as the universe expanded after the Big Bang?

Answer and explanation

Correct answer: It decreased

The governing concept is cosmic expansion and cooling. In the early universe, matter and radiation were compressed into an extremely hot, dense state. As space expanded, the same energy became distributed through a larger volume, so the average energy density and temperature fell. Radiation was also stretched to longer wavelengths, reducing its energy. Therefore, option C is correct: the temperature decreased as the universe expanded after the Big Bang. Option A reverses the observed relationship, while option B ignores the cooling produced by expansion. Option D is incorrect because temperature did not disappear; it declined and remains measurable in the cosmic microwave background.

Related tags

Early And Modern TheoriesThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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