(a)[3]
Calculate the speed of the waves.
(b)[3]
State and explain what occurs to the waves as they pass across the edge of the block.
(c(i))[1]
State the name of one region in Fig. 6.2 whose wavelengths are longer than those of visible light.
(c(ii))[1]
Describe one use of ultraviolet radiation.
(c(iii))[1]
Compare the speed of radio waves with the speed of gamma rays while both are travelling through a vacuum.