(a) Differences between a sound wave and a radiowave Sound wave Radio wave is a mechanical wave is an electromagnetic wave is longitudinal is transverse has speed less than speed of light. has speed equal to that of light requires a material medium for propagation/cannot travel through vacuum. does not require a material medium for propagation/can travel through vacuum. (b) The vibrating tuning fork forces the table top to vibrate. The table top has a much larger area and is therefore in contact with a larger volume of air undergoing vibration. Hence, sound heard is amplified. (c) Conditions necessary for: (i) production of stationary wave - Two waves must be traveling in opposite directions. - Incident and reflected waves must have the same frequency/wavelength. - Incident and reflected waves must have equal amplitude. - There must be superimposition. - There must be a barrier (ii) formation of interference wave pattern - Two sources must be involved. - The two sources must be coherent/have a constant phase difference as well as the same frequency and amplitude. - The waves that are interfering must have the same amplitude - The distance between the sources must be of the order of the wavelengths of the waves. (iii) total internal reflection - The wave must be traveling from a denser medium to a less dense medium - The angle of incidence of the wave in the denser medium must be greater than the critical angle for the medium. (d)(i) Diagram Correct diagram (ii) \(\frac{ Sin (A + dm)}{2}\) n = Sin (A/2) Sin (60 + 41)/2 Sin (60/2) = 1.54