To determine which wave has the lowest frequency, we can use the formula that relates wave speed (v), wavelength (λ), and frequency (f):
\[ f = \frac{v}{\lambda} \]
Given that the wave speed (vw) for all waves is 600 m/s, we can calculate the frequency for each wave using their respective wavelengths (λ):
-
Wave L:
- λ = 120 m
- \( f_L = \frac{600}{120} = 5 , \text{Hz} \)
-
Wave M:
- λ = 150 m
- \( f_M = \frac{600}{150} = 4 , \text{Hz} \)
-
Wave N:
- λ = 100 m
- \( f_N = \frac{600}{100} = 6 , \text{Hz} \)
-
Wave O:
- λ = 50 m
- \( f_O = \frac{600}{50} = 12 , \text{Hz} \)
Now, we can compare the frequencies:
- Wave L: 5 Hz
- Wave M: 4 Hz
- Wave N: 6 Hz
- Wave O: 12 Hz
The wave with the lowest frequency is wave M (4 Hz).
So the answer is wave M.