(a)[1]
State the name of the nuclear reaction occurring at the Sun’s centre.
(b(i))[2]
Heat energy leaves the Sun’s surface and travels into space. Because the transfer passes through the vacuum of space, it happens by thermal radiation. Describe the radiation emitted from the Sun’s surface.
(b(ii))[1]
State the speed of this radiation when travelling through a vacuum.
(b(iii))[2]
The Earth is $1.5 \times 10^{11}\,\text{m}$ from the Sun’s surface. Calculate the time needed for this radiation to reach Earth.
(c)[2]
Explain one benefit of wearing white clothes on a sunny day.