(a(i))[2]
Sound from the radio causes the air particle at X to vibrate. On Fig. 7.1 draw two arrows at point X to show the directions in which the air particle vibrates.
(a(ii))[1]
Which term correctly describes the sound wave? Tick one box. transverse longitudinal electromagnetic
(a(iii))[2]
Suggest a value for the frequency of sound that the man can hear. State the unit.
(a(iv))[1]
Explain why the man is unable to hear ultrasound.
(b(i))[2]
Use the graph to calculate the speed of ultrasound travelling in sea-water.
(b(ii))[2]
Use the graph to determine the sea depth.