The height of the crests of a wave is called its

Options

A. amplitude
B. displacement
C. frequency
D. none of these

Explanation

To solve the question regarding the height of the crests of a wave, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Components of a Wave**: A wave consists of various parts, including crests (the highest points) and troughs (the lowest points).

2. **Identify the Crest**: The crest is defined as the maximum height of the wave above the equilibrium position.

3. **Define Amplitude**: The amplitude of a wave is the maximum displacement from the equilibrium position, which is measured from the crest to the equilibrium line (or rest position).

4. **Conclusion**: Therefore, the height of the crests of a wave is referred to as the **Amplitude** of the wave.

### Final Answer:
The height of the crests of a wave is called its **Amplitude**.

---