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    The peak wavelength of the cosmic microwave background (CMB) radiation spectrum corresponds to a temperature of 2.76 K.

    Question
    SLPaper 3

    The peak wavelength of the cosmic microwave background (CMB) radiation spectrum corresponds to a temperature of 2.76 K.

    1.

    Identify two other characteristics of the CMB radiation that are predicted from the Hot Big Bang theory.

    [2]
    Verified
    Solution

    isotropic/appears the same from every viewing angle ✓\checkmark✓ homogenous/same throughout the universe ✓\checkmark✓ black-body radiation ✓\checkmark✓

    2.

    A spectral line in the hydrogen spectrum measured in the laboratory today has a wavelength of 21 cm. Since the emission of the CMB radiation, the cosmic scale factor has changed by a factor of 1100. Determine the wavelength of the 21 cm spectral line in the CMB radiation when it is observed today.

    [1]
    Verified
    Solution

    23100 «cm» OR 231 «m» ✓\checkmark✓

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