The spectrum of the cosmic microwave background peaks at a wavelength of about 1 mm, and the universe has a temperature of about 3 K. If the spectrum instead peaked at a wavelength of 10 millimetres, what would its temperature be?

Question

Answer

About 3 K, because wavelength is unrelated to the peak temperature.

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Less than 3 K, because lower temperatures correspond to longer wavelengths.

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More than 3 K, because by the time the peak temperature is 10 mm, the Universe will be contracting.

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Less than 3 K, because the Universe slowly cools down over time.

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About 3 K, because temperature won’t change significantly with such a small change in wavelength.

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More than 3 K, because higher temperatures correspond to longer wavelengths.

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The spectrum of the cosmic microwave background peaks at a wavelength of about ...

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