1. You are sitting on a pier, watching the waves on the water. They are very regular waves on this particular evening. You notice that each successive wave crest reaches the first piling(supporting pole) exactly 1.6 seconds apart. You also notice that each wave crest takes 2.4seconds to travel from the first piling to the second piling. You measure the distance between the pilings to be 3.6 m. For the water waves: (a) Calculate the wave speed. (b) Calculate the wave frequency. (c) Calculate the wavelength. (d) State whether they are longitudinal or transverse. Some fireworks are then released from a boat in the harbour. You want to estimate how faraway the fireworks are and you determine the time between seeing the firework explode and-hearing the explosion to be 1.3 seconds. (e) Calculate the distance from you to the fireworks. (f) In making this calculation, you have made several assumptions. State one of these, and what the effect would be on your result if your assumption was incorrect. [2 marks]