(a(i))[1]
State the time at which CMBR was produced.
(a(ii))[2]
State and explain how the wavelength of this radiation has altered since it was formed.
(b(i))[3]
Calculate Venus’s average orbital speed v. Give your answer in km/h.
(b(ii))[1]
State how the average surface temperature of a planet changes as its distance from the Sun increases.