Answer
1.1 mm
Work Step by Step
Use Wien’s law, equation 27–2.
$$\lambda_p =\frac{2.90\times10^{-3}m \cdot K}{T}$$
$$\lambda_p =\frac{2.90\times10^{-3}m \cdot K}{2.7K}=1.1\times10^{-3}m$$
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