Answer:
f = 0.65 hz
Step-by-step explanation:
Given that,
The distance between adjacent crests, wavelength = 2.4 m
6 crests are observed to move past a given point along the medium in 9.1 seconds.
We need to find the frequency of these waves.
We know that,
Frequency = no. of waves per second.
![f=(6)/(9.1)\ Hz\\\\=0.65\ Hz](https://img.qammunity.org/2022/formulas/chemistry/college/jrspkrua0xlyj0s7qcw0mzdbc7zcfnnjpp.png)
So, the frequency of these waves is equal to 0.65 Hz.