A wave travels across the surface of water - AQA - A-Level Physics - Question 15 - 2020 - Paper 1

To determine the correct descriptions of $w$ and $z$, we refer to the characteristics of wave properties illustrated in the diagram:

1. Understanding $w$: The variable $w$ refers to the maximum displacement of water particles from their rest position, which is defined as the amplitude of the wave.

2. Understanding $z$: The variable $z$ represents the distance between successive peaks of the wave. This distance is known as the wavelength.

Therefore, the correct descriptions are:

• $w$ is the amplitude.
• $z$ is the wavelength.

From the options provided, the correct row is A: amplitude and wavelength.