QUESTION 7 (start on a new page) 7. The following diagram represents a wave in a spring. llllllm 7.1 What type of wave (longitudinal or transverse) is this? Give a reaso for your answer? 7.2 The distance from one compression to the next is equal to 10 cm Calculate the frequency of the wave, in Hz, if the speed of the wave is equal to 20 crn-s-1.​