Introduction to Cosmology Example Exam Question

Lecture 17: Cosmic Microwave Background: Experiments

CMB power spectrum
The picture above shows the power spectrum of the CMB as measured by WMAP and the ground-based experiments CBI and ACBAR. Explain, quantitatively if possible,
(i)  why the main peak is at an angular scale ∼1°, and what cosmological parameter is measured by the position of the peak; [4]
(ii) how the smaller peaks can be used to distinguish between baryonic and non-baryonic contributions to the density. [3]

(2005, part of Q8.)

Go to the hints and suggestions.