| 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.)