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

Question

SLPaper 3

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 $\checkmark$

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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