Two sound waves A and B travel through air at 25∘C, so both move with the same speed.
(i) Define wavelength.
(ii) If the frequency of wave B is exactly twice that of wave A, state which wave has the longer wavelength and explain the factor by which the two wavelengths differ.
(iii) A third sound wave C has a frequency that is one-half of the frequency of A. Arrange the wavelengths of A, B and C in ascending order, giving suitable reasoning for each successive comparison.