Given below are some examples of wave motion. State in each case, if the wave motion is transverse, longitudinal or a combination of both?
(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.

Explanation

To determine the type of wave motion for each example provided, we will analyze the nature of the wave and the direction of particle motion in relation to the wave direction.

### Step-by-Step Solution:

1. **Example (i)**: Motion of a kink in a long coil spring produced by displacing one end of the spring sideways.
- **Analysis**: When one end of the spring is displaced sideways, the kink travels along the spring. The particles of the spring move up and down (perpendicular to the direction of the wave).
- **Conclusion**: This is a **transverse wave**.

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