Some examples of wave motion are given in the following options. In which case wave motion is a combination of both transverse and longitudinal waves?
(i) Motion of a kink in a long coil spring produced by displacing one end of spring side ways.
(ii) Waves produed in a cylinder containing a liquid by moving its piston back and forth.
(iii) Waves produed by a motor boat sailing in water.
(iv) Light waves travelling from sun to earth.
(v) ultrasonic waves in air produced by a vibrating quartz crystal.