# Physics

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If the cosmic microwave background radiation (CMBR) is at a temperature of 2.7K, what is its peak wavelength?

• Physics -

Wien's displacement law
b =2.9•10^-3
λ= b/T= 2.9•10^-3/2.7 =1.07•10^-3 m

• Physics -

Suppose when we look in one half of the sky, the CMBR appears to be at a temperature of 2.72K. What is the peak wavelength in that direction? Are we moving toward or away from the region of space? What is our velocity with respect to the CMBR?

• Physics -

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