(a(i))[2]
State the names of the three regions in ascending order of frequency.
(a(ii))[2]
Some of the ultraviolet radiation emitted by the Sun reaches the Earth’s surface. Give one possible harmful effect of ultraviolet radiation on the human body and the property of ultraviolet radiation that causes this harm.
(b)[2]
Electromagnetic radiation is a transverse wave. Describe how a transverse wave differs from a longitudinal wave.