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To find the speed of the waves, we can use the formula for wave speed:
\[
\text{Wave speed} = \text{Frequency} \times \text{Wavelength}
\]
1. **Calculate the frequency**:
- You observed that 2 waves pass by in 4 seconds.
- Frequency (f) is calculated as:
\[
f = \frac{\text{Number of waves}}{\text{Time}} = \frac{2 \text{ waves}}{4 \text{ seconds}} = 0.5 \text{ Hz}
\]
2. **Determine the wavelength**:
- The distance between each wave crest (wavelength) is given as 2 meters.
3. **Now, plug in the values**:
- Wavelength (λ) = 2 m
- Frequency (f) = 0.5 Hz
\[
\text{Wave speed} = f \times \lambda = 0.5 \text{ Hz} \times 2 \text{ m} = 1 \text{ m/s}
\]
Therefore, the speed of the waves is **1 m/s**.