# Phenomena of Waves

### Q & A

What is the function of the Eccentric/Motor?

The function of the eccentric /motor is to produce a reciprocating motion.

### Q & A

What is the function of the dipper?

1. To produce waves of different shape
2. Straight parallel waves may be produced by a horizontal wooden bar.
3. Circular waves may be produced by a vertical ball-ended rod.

### Q & A

What is the function of the sponge beach?

The function of the sponge beach is to prevent reflection of the waves.

### Q & A

Explain how the dark and light bands are formed on the screen.

1. The dark and light bands formed on the screen owing to the refraction of light.
2. As shown in figure above, when the light from the light house passes through the area around the peak of a wave, the light will be converged and form a bright band on the screen.
3. Conversely, when the light from the light house passes through the area around the trough of a wave, the light will be diverged and form a dark band on the screen.

### Phenomena of Waves

1. There are 4 phenomena of waves:
1. Reflection
2. Refraction
3. Diffraction
4. Interference
2. Diffraction and interference are unique phenomena. Only waves perform these phenomena.