(a(i))[2]
Calculate the speed of sound in the water.
(a(ii))[1]
State a representative value for the speed of sound in air.
(a(iii))[1]
State and explain, for the sound from the loudspeaker, how the wavelength in air compares with the wavelength in water.
(b)[2]
Sound is a longitudinal wave. Explain what is meant by the term longitudinal wave.
(c(i))[1]
State how the width of the gap influences the diffraction.
(c(ii))[1]
State how the wavelength of the sound influences the diffraction.