To determine which wave has the lowest frequency, we can use the formula for wave frequency:
\[ f = \frac{v}{\lambda} \]
where:
- \( f \) is the frequency,
- \( v \) is the wave speed,
- \( \lambda \) is the wavelength.
In the table, the wave speed \( v \) is constant at 600 m/s for all waves. We need to calculate the frequency for each wave:
-
Wave L: \[ f_L = \frac{600 \text{ m/s}}{120 \text{ m}} = 5 \text{ Hz} \]
-
Wave M: \[ f_M = \frac{600 \text{ m/s}}{150 \text{ m}} = 4 \text{ Hz} \]
-
Wave N: \[ f_N = \frac{600 \text{ m/s}}{100 \text{ m}} = 6 \text{ Hz} \]
-
Wave O: \[ f_O = \frac{600 \text{ m/s}}{50 \text{ m}} = 12 \text{ Hz} \]
Now we compare the frequencies:
- \( f_L = 5 \text{ Hz} \)
- \( f_M = 4 \text{ Hz} \)
- \( f_N = 6 \text{ Hz} \)
- \( f_O = 12 \text{ Hz} \)
The wave with the lowest frequency is wave M, with a frequency of 4 Hz.
So, the answer is: wave M.