Question: Three hundred thousand years after the Big Bang, the temperature of the universe was 3000 K. Because of expansion, the temperature of the universe is

Three hundred thousand years after the Big Bang, the temperature of the universe was 3000 K. Because of expansion, the temperature of the universe is now 2.75 K. Modeling the universe as an ideal gas and assuming that the expansion is adiabatic, calculate how much the volume of the universe has changed. If the process is irreversible, estimate the change in the entropy of the universe based on the change in volume.

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