The distance between two consecutive crests is L, then the wavelength is given by

Options

A. L/2
B. 2L
C. 4L
D. L

Explanation

To solve the problem, we need to understand the relationship between the distance between consecutive crests and the wavelength of a wave.

### Step-by-Step Solution:

1. **Understanding the Wave Structure**:
- A wave consists of alternating crests (the highest points) and troughs (the lowest points). The distance between two consecutive crests is an important characteristic of the wave.

2. **Identifying the Wavelength**:
- The wavelength (λ) is defined as the distance between two consecutive points that are in phase. For a sinusoidal wave, this can be the distance between two consecutive crests or two consecutive troughs.

3. **Given Information**:
- The problem states that the distance between two consecutive crests is L.

4. **Relating Distance to Wavelength**:
- Since the distance between two consecutive crests is equal to the wavelength, we can express this relationship mathematically:
\[ \lambda = L \]

5. **Conclusion**:
- Therefore, the wavelength (λ) is equal to the given distance L.

### Final Answer:
The wavelength is given by:
\[ \lambda = L \]