a) i) What is meant by the term 'wave motion'? (2 marks) ii) Distinguish between transverse waves and longitudinal waves, giving ONE example of each. (4 marks) b) A progressive wave is represented by the equation y = 8 sin(100πt - 0.5πx), where y is the displacement in centimetres, t is the time in seconds and x is the distance in centimetres. Determine: i) the amplitude of the wave; (1 mark) ii) the frequency of the wave; (2 marks) iii) the wavelength of the wave; (2 marks) iv) the wave speed. (2 marks) c) State TWO differences between a stationary (standing) wave and a progressive wave. (2 marks)