(a)[4]
To work out the speed of sound in air, some students could use an echo method. Describe one suitable method and include the measurements they need to make.
(b(i))[1]
Which distance shows the amplitude of the wave? Circle your answer. AC, AF, BE, DE, CF.
(b(ii))[1]
Which distance shows the wavelength of the wave? Circle your answer. AC, AF, BE, DE, CF.
(b(iii))[2]
In Fig. 8.1, sketch this wave.