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## Homework Statement

Two scientists detected the cosmic microwave background radiation at a frequency of 160 GHz. What is the temperature of the universe?

## Homework Equations

peak wavelength x temperature = 2.898 x 10^-3

c = f x wavelength

## The Attempt at a Solution

I calculated the wavelength of the microwave radiation to be 1.875x10^-3m. So the temperature is 1.5456K.

But the answer is 3K... How come??