Question: Between between 2009 and 2013, the Planck space observatory mapped the anisotropies of the Cosmic Microwave Background at microwave and infra-red wavelengths. The CMB has

Between between 2009 and 2013, the Planck space observatory mapped the anisotropies of the Cosmic Microwave Background at microwave and infra-red wavelengths. The CMB has a peak spectral radiance at a frequency of 160.23 GHz. The Planck telescope was designed to achieve a resolution of approximately 5 (5 arcminutes) at this frequency. Use this information to show why the Planck telescope has a mirror diameter of 1.5 m.

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